62 



:\rEMUIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



I. PALEOIiEPIDOPTERA (I'ujxv libero). 



Tlio characters of the group arc tliose of Micropteryx, as this is the only genus yet known.. 



Its hirva has a well developed spinneret; though it has no abdominal legs, the other features 



are so truly lepidopterous that the absence of legs may 

 be the result of redaction by disuse rather than a primitive 

 feature. 



The pui)a (fig. '>) has entirely free antenna-, mouth- 

 parts, and limbs, and bears considerable resemblance to 

 that of a caddis fiy. It is a, pupa libera. 



The mandibles (fig. 5 md.) are enormous and, as 

 described by Cha])man, are adapted for cutting through the 

 dense cocoon. The maxilhc are separate and curled up 

 on each side and jiartly concealed by the second maxil- 

 lary (labial) palpi (tig. 5 mx. p.), not extending straight 

 down, as in the Pkjxv hicomplctw and obfectw ; the maxil- 

 lary palpi are situated just in front of the mandibles 

 and extend outward and forward, reaching to the antenna'. 

 The labrum is deeply cleft and strongly setose, as is the 

 epicraniuu); the clypeus is Sfpiare, with a singular white 

 delicate membrane projecting from it, the use of which is 

 unknown. The hind legs extend beyond the end of the 

 abdomen, which is simple, not terndnating in a cremaster^ 

 the sides of the segments bear a single large seta. 



The trunk characters of the imago are much as in 

 Eriocephala. The head is larger and squarer; the eyes 

 very small; there are two ocelli present; the clypeus and 

 labrum arc short and small. 



The prothorax is very much reducdd, much as in Erio- 

 cephala; the metathoracic scuta show an advance over those 

 of Eriocephala iu being united on the median line instead of 



separated; the metascutelluni is very large, longer and more scutellate than that of Eriocephala. 

 The shape and venation 



of the wings (fig. 0) are nearly 



identical with those of Erio- 



cei)hala, being long, narrow, 



and pointed, both pairs nearly 



alike in size, and except that 



on the hinder pair there is a 



'•jugum '' or angular anal fold ; 



the scales are of generalized 



shape all over the wings. 



II. NEOLEPIDOPTERA. 



This series may be divided 

 into two sections, correspond- 

 ing in the main to the Piipcc 

 iitcompletw of Chapman (the 

 Eri()ce])halida' and Microp- 

 terygiche included by Chap- 

 man being removed) and his 

 J'lipa- ohtfctd', for the first of which we would suggest the name TiiicoiilN, and for the second, 

 compiising the large broad-winged fornjs, .Macrolepiiloptcra or I'latylepidoptera. 



Flo. 5. — Pupa of Micropteryx puvpurclla, frout 

 view; tnd, niaudibk's; mx. p, maxillary palpiLS; 

 vix'. p, labial palpus ; lb, labraiu, with its long setff . 



Fig. 6.— Venation of fore and hind vrinRS of ilicropteryx purpureUa; j, juguin, on caebwing; 

 t/. disral vein. I,co8ta; Il.subcosta; III, media; IV, cubitus, etc. 



