June, 1902] 



PSYCHE. 



353 



not well marked. Color uniforinly yellowish 

 white, except where the internal organs pro- 

 duce a grayish tint owing to the transparency 

 of the integument. Head black, shining, 

 oblong, but little narrowed in front ; about 

 one-half longer than wide. The posterior 

 margin above is acutely emarginate. The 

 occipital lines slightly convergent posteriorly, 

 more strongly near their coalescence, which 

 is at the angle of the posterior emargination. 

 Antennae rudimentary, extending but little 

 above the surface of the head ; the cavities at 

 their bases large and distinct. Ocelli absent. 

 Labrum prominent, the fleshy part emargi- 

 nate in front ; the horny, basal part pectinate 

 along the inne margin, the teeth slender and 

 curved. Mandibles subtriangular, regularly- 

 serrate along the inner margin, otherwise 

 without teeth or protuberances. Body 

 smooth, entirely without hairs or spines. 

 First thoracic segment nearly as long as the 

 following, after which the segments increase 

 in length, the anal one being equal to the 

 head and first thoracic segment together. 

 Body much contracted in the anal segment, 

 although the integument is not so sharply 

 constricted. The rudiments of the compound 

 eyes of the imago are distinctly seen as two 

 dark oval discs near the surface of the dorsal 

 sclerite of the first thoracic segment, directly 

 above the imaginal discs of the first pair of 

 legs. 



Pupa. Length 7.5 mm. Entire body 

 nearly white with the stigmata black. 



Several nearly grown larvae of this 

 species were found under the bark of a 

 fallen oak log. They soon pupated and 

 one of them which was allowed to trans- 

 form, emerged after a pupal stage of only 

 fifty hours duration. The larvae spin a 

 delicate web in which they lie suspended 

 and move about under the bark. They 

 are so extremely delicate that the web is 

 necessary to prevent them from being 



dried up from contact with the dry bark. 

 At times the larva moves its head towards 

 the web and apparently eats the strands 

 as it glides along. After pupation it lies 

 half suspended in the web, which ad- 

 heres to the integument wherever it 

 touches. 



EUXESTA NITIDIVENTRIS Lw. 



A very large number of fully grown 

 larvae which proved to belong to this 

 species were found beneath the bark of 

 a dead pecan tree {Carya pecan) during 

 the month of January. They were clus- 

 tered together in groups of a hundred or 

 more individuals, their bodies adhering 

 together on account of their very sticky 

 consistency. The greater number of the 

 larvae were seen at a distance of five or 

 six feet above the surface of the ground. 

 Their habitat is like to that of one of the 

 European Ortalinae, Fsairoptera, which 

 has been found under the bark of pine 

 trees. (Zetterstedt, Diptera Scandina- 

 viae, VI, p. 2265.) 



Larz'a. Length 4-6 mm. Body composed 

 of eleven segments, narrow and somewhat 

 pointed anteriorly, gradually enlarged pos- 

 teriorly, the apex rounded. Mouth parts 

 very retractile, the hooks separated. Head 

 nearly as long as the first two thoracic seg- 

 ments together. Body segments without any 

 distinct ambulatorial projections, the seg- 

 ments being only slightly produced ventrally 

 at the margins. The anal segment bears two 

 subdorsal papillae on the sides of which the 

 stigmata are situated. 



The larval habits of this species are 

 quite different from those of the closely 

 related E. notata, Wied. which was bred 



