238 



TRANS. ST. LOUIS AGAD. SCIENCE. 



[i-i:^.iu] 



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, d", 5, 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, belonging to the genus Sarcophaga. The 

 mother-fly drops her living larvae within the tube to the number 



of upward of a dozen, and 

 these easily find their way to 

 the bottom, where they feed on 

 tlie softer parts of the macer- 

 ated insects which have accu- 

 mulated there. As a rule, but 

 one of the Sarcophaga larvs 

 matures, the others having fall- 

 Sarcohhaga sarr ageing. — i?, larva; i>, en victims to its gluttouy and 



pupa; (T. fly, the hair-lines showinij average na- . , Airi r u 



tural lengths ; rf. euhirjjed head and first joint SUpcnOr Strength. When tuU 



of larva, showing curved hooks, lower lip {£'), /- , .1 1 •. 1 



and prothoracic spiracle ; r, end of body of same, iCd, Or rather Wlicn it liaS ap- 

 showing stigmata (/^) and prnlegs and vent ; //, • . 1 11 .^1 • 1 



tarsal cfaws of fly with pro ectiifg pads ; /, an- propriatcd all the uounshment 



tennaofsame All enlarged. .1 1 iU* „ _ «. 1 



* at hand, this 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 wrirrkle on 

 each joint more particularly prominent laterally. Head extremely small, 

 or \ as large as joint i ; showing a division into two maxillary lobes at 

 the tip, and a larger labial lobe, beneath, with a small bunch of ."-etbus 

 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. Prothoracic spiracle pale rufous, retractile, sponge-like, stud- 

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



