Two new species of Neomachilellus Wygodzinsky (Meinertellidae, Microcoryphia) from the state of Amazonas, Brazil

Two new species of M ic rocoryph ia , Neomachi le l lus adisi and N . scandens, occur r ing in the inundat ion fores ts near Manaus and co l lec ted In t reet raps, are descr ibed and compared to other species of the genus. The present paper contains the de­ script ions of two new species of the large, mainly neotropical machil id genus Neomachi­ lellus Wygodzinsky, wi th the purpose of making their names available for ecosystem analyses now being carried out by Adis (1977) in the inundation forests near Manaus, be­ tween December 1975 and May 1977. The species here described belong to a group of the genus so far known only f rom southern Brazil. The apparent absence near Manaus of the northern South American genus Meinertellus Si lvestri is notable. Neomachilellus adisi, sp. n.

The present paper contains the de scriptions of two new species of the large, mainly neotropical machilid genus Neomachi lellus Wygodzinsky, with the purpose of making their names available for ecosystem analyses now being carried out by Adis (1977) in the inundation forests near Manaus, be tween December 1975 and May 1977. The species here described belong to a group of the genus so far known only from southern Brazil. The apparent absence near Manaus of the northern South American genus Meinertellus Silvestri is notable.
Head with 1 + 1 pigment spots between ocelli and 1 + 1 spots behind ocelli (figs. 1A, 3D). Color pattern of eyes ( fig. 2A) consisting of three dark, curved stripes, their curvature parallel to that of anterior margin of eyes; uppermost dark stripe wider than the two others. Eyes approximately as long as wide, their line of contact equal to five sixth of their length. Ocelli (figs. 1A, 3D) only slightly shorter than anterior border of eyes, narrowly sole-shaped. Head capsule without secondary sexual -characters. Antennae longer than body. short setae on the under surface of the hind tibiae, much longer in albuquerquei, and by the smaller field of short semierect setae on the apex of the second article of the maxillary palp of the male.

ETYMOLOGY;
This species is named for its collector.

DISCUSSION:
In the last published key to the species of Neomachilellus (Wygodzinsky, 1952), N. adisi would key out to N.
ibiti Wygodzinsky, N. lenti Wygodzinsky and N. al buquerquei Wygodzinsky, all described from southern Brazil. N. adisi differs from ibiti by the presence of well developed pigment on the legs, absent in ibiti; by the much narrower distal article of the labial palp, in both sexes, and by the hypodermal pigment arranged in a dark, narrow longitudinal band on the second article of the maxiallry palp, very faint in ibiti. N. adisi can be distinguished from N. lenti by the relatively short apical spine of the stylets of urosternite V, the spine being as long as the stylet itself in lenti; by the very short setae of the under surface of the hind tibiae, much longer in lenti; by the absence of a field of short spiniform setae on the apical portion of the second article of the maxillary palp of the male, present in lenti, and by the slightly but distinctly darkened intermediate jointlets of the flagellum of the antennae, concolorous with the chains in lenti. Finally, N. adisi can be distinguished from N. albuquerquei by the much more extensive pigment on the maxillary palpi; by the presence of pigment on the legs, almost absent in albuquerquei; by the very Remaining articles without special features, seventh as long as penultimate. Labial palpi narrowly bordered with pigment along anterior surface (figs. 4D, 5G). Terminal article of labial palp strongly widened in both sexes, almost twice as long as wide in male.
Pigmentation of legs as shown in figure  5B. C, similar in both sexes, characterized by wide extension of pigment on tibiae, especially on fore legs. Femora and tibiae without spine like setae, although some present on tarsi Under surface of posterior tibiae with dense, slender, medium-sized setae ( fig. 41).
Stylets of ninth segment of male six seventh as long as coxite. in female two thirds as long as coxite. Distal spine of styles V

DISCUSSION :
Neomachilellus scandens also keys out to N. ibiti, N. lenti and N. albuquerquei. N. scandens can be distinguished from ibiti by the relative length of the terminal article of the maxillary palp, equal in length to the penultimate article in scandens but distinctly shorter than the penultimate in ibiti, and by the apical spine of stylet V, about two thirds as long as the stylet proper in scandens and much shorter in ibiti. N. scandens differs from N. Icnti by the absence, in the male, of a group of short spiniform setae on the apex of the second article of the maxillary palp, present in lenti, and by the relative size of the terminal article of the maxillary palp of both sexes, as long as the penultimate in scandens but much shorter than the penultimate in lenti. Finally, N. scandens is distinguished from N. albuquerquei by the apical spine of the stylets V, two thirds as long as the stylet proper in scandens but only about half as long as the stylet in albuquerquei.
In albuquerquei, the terminal article of the maxillary palp is much shorter than the penultimate, but about as long as the penultimate in scandens.
Con spicuous hypodermal pigment is present on articles l-IV of the maxillary palp in scandens, but only on articles l-IV in albuquerquei.
Neomachilellus adisi and N. scandens are occasionally collected together and are clearly sympatric in the Manaus area. The two species can be distinguished as follows: (Aceito para publicação em 10/05/78)