23S TRANS. ST. LOUIS ACAD. SCIENCE. 



The species is very variable, the dividing line of the two colors, on 

 primaries, being usually across the middle, but in some specimens much 

 nearer the base of the wing. A striking variety (two specimens) is of a 

 uniform straw-yellow, with the faintest dusky shade across the middle and 

 subterminal portions of primaries ; while several have the dark parts more 

 or less suffused with yellow. 



Twenty-five specimens examined, $, $>, mostly reared from the larva. 

 The scales are very slightly attached, and it is difficult to get good speci- 

 mens except by rearing them. 



The second insect which is always found connected with Sar- 

 racenia is a Dipter, helonging to the genus Sarcophaga. The 

 mother-fly drops her living larva; within the tube to the number 

 [Fig. 11.] °f upward of a dozen, and 



these easily find their way to 

 the bottom, where they feed on 

 the softer parts of the macer- 

 ated insects which have accu- 

 mulated there. As a rule, but 

 one of the Sarcophaga larva; 

 matures, the others having fall- 

 sakcophaga sakracein.k. — a, larva; b, en victims to its gluttony and 



pupa; c. fly, the hair-lines shovvintr average na- . . ,,.. c ., 



tural lengths; d. enlarged head and first joint Superior Strength. When full 



of larva. "show-ins: curved hooks, lower lip (jr), ... , , . , 



and prothoraciefpiraele; send of body of same, ted, Or rather when it liaS ap- 

 showing: stiemata ( f) and iirnk'gs itnd vent; It, , 11.1 • 1 



tarsal daws of „ v with proiectino- pads ; /, an- propnated all the nourishment 



tennaofsame All enlarged. ^ ^^ ^ maggot works 



through the tube (by this time weakened and decayed at base) 

 and burrows in the ground, where it undergoes its transforma- 

 tions, and whence in a week or more, according to the season, 

 the fly emerges. The species may be recognized from the fol- 

 lowing description : 



Sarcophaga sarraceni.e, n. sp. Larva — 0.30-0. S5 inch long. Body 

 composed of but 11 visible joints exclusive of the head; microscopically 

 and transversely shagreened ; transversely wrinkled, the hind wrinkle on 

 each joint more particularly prominent laterally. Head extremely small, 

 or } as large as joint 1 ; showing a division into two maxillary lobes at 

 the tip, and a larger labial lobe, beneath, with a small bunch of setous 

 fibres issuing from it; the black retractile jaws, of the ordinary form, issu- 

 ing between these lobes, and the antenna? showing in two small rufous 

 projections above the maxillary lobes: sparsely armed anteriorly with mi- 

 nute conical, sharp-pointed spines, decurved in front, directed backward 

 beneath. Prothoiacic spiracle pale rufous, retractile, sponge-like, stud- 

 ded with numerous lobules, divided at the end into a variable number of 



