ART. 2 LARVAE AND PUPAE OF THE FAMILY LEPTIDAE GREENE 6 



3. Chitin on the dorsum of the first segment shaped like small amoebae. 



(No. 2 1 Rhachicerus nitidus Johnson. 

 Chitin on the dorsum punctate 4 



4. Chitin on the first two segments only; posterior spiracles elliptical in 



shape as in figure 37i (No. 3) Xylophagus lugens Loew. 



Chitin on the first three segments; posterior spiracles oval in shape 

 as in figure 4y (No. 4) Xylophagus abdominalis Loew. 



5. Larva with prolegs on all the abdominal segments ; two plumose caudal 



appendages (No. 5) Atherix variegata Walker. 



Larva not as above 6 



6. With several large bristles near the caudal end which have hooks at 



the apex; head capsule large (No. 6) Vermileo comstockii Wheeler. 



Not as above but with four lobes at the caudal end. 



(No. 7j Chrysopila, species.^ 



PUPAE 



TABLE OF STECIES 



1. Outer puparium shaped like the larva : transparent pupal skin always 



protruding from the dorsal exit hole (No. 1) Xylomyia pallipes Loew. 



Puparium not shaped like the larva 2 



2. From a dorsal view, the antenual capsules are at the anterior end of 



the head 3 



From a dorsal view, the antennal capsules are below the anterior end 

 of the head 5 



3. With processes at the antero-basal portion of the antennal capsules — 4 

 Without antennal processes ; antennal capsules free ; a circlet of long hairs 



on the dorsal side of the eye ; spiracles as in figure 8. 



(No. 8) Xylophagus abdominalis Loew. 



4. Antenual processes pointed and directed outward ; spiracles as in figure 



9 ^^ (No. 9) Xylophagus lugens Loew. 



Antennal processes flattened and directed forward, inner apical points 

 touching ; spiracles with l)ead-like slits as in figure 10. 



(No. 10) Rhachicerus nitidus Johnson. 



5. Head small ; abdomen tapering posteriorly to a point : spiracles very small ; 



anterior thoracic spiracle with a large spine below : abdominal spiracles 

 reniform with four radiating pale lines, see figure 11. 



(No. 11) Vermileo comstockii Wheeler. 

 Head large ; sides of abdomen nearly parallel 6 



6. Anterior portion of head with a very large rugose prominence; puparium 



very large and robust : spiracles as in figure 12. 



(No. 12) Coenomyia ferruginea Scopoli. 

 Head without the prominence 7 



7. Spiracles located on large fiattened chitiuous plates as in figure 13. 



(No. 13) Leptis mystacea Macquart. 

 Spiracles not on a flattened plate 8 



8. Spiracles quite small ; slits arranged in pairs with light-colored spaces 



between as in figure 14 (No. 14) Chrysopila quadrata Say. 



Spiracles larger and more normal in size 9 



9. Spiracular plate rounded 10 



Spiracular plate elongate elliptical as in figure 15. 



(No. 15) Chrysopila fasciata Say. 



1 This species is either Chrysopila ornata or tlwnuica. 



