220 



PSYCHE. 



;jf February 1S92. 



that the fat-body is not derived from the 

 oenocytes, that it is not of ectodermal 

 bvit of mesodermal origin as claimed by 

 the majority of authors, and that there 

 is no evidence for the origin of the blood 

 from the oenocytes. 



It is interesting to note that only the 

 winged orders of Hexapoda, the Ptery- 

 gota, seem to possess oenocytes. I could 

 find no traces of these peculiar cells in 

 Lepisma saccharina, Campodea fra- 

 gilis (young and adult) and Anurida 

 7naritima, insects which may be taken 



to represent the three families of the 

 Apterygota. If oenocytes exist at all 

 in this subdivision of the Hexapoda, 

 they are probably confined to the 

 embryo or to the forms most closely 

 allied to the Orthoptera — like Machilis. 

 I believe that oenocytes do not occur 

 in the Myriopoda. In the just-born 

 young of Scolopendra complanata from 

 the Galapagos I find no traces of them 

 and so far as I am aware they have not 

 been described by any of the investi- 

 gators of Myriopod anatomy. 



DESCRIPTION OF A SARCOPHAGA BRED FROM HELIX. 



BY C. H. TYLER TOWNSEND, LAS CRUCES, N. MEX. 



I have recently received from Mr. H. 

 A. Surface, of the Ohio experiment 

 station, a small Sarcophagid which he 

 bred from Helix thyroides Say, while 

 engaged on his catalogue of shells of 

 Franklin County, published in Bulletin 

 2, volume 1, technical series, of that 

 station. 



Mr. Surface accompanies the speci- 

 men with the following note : "The 

 snail w r as placed in a tight bottle Au- 

 gust 25, in Warren County, Ohio, and 

 during the first part of September the 

 pupae were seen. From September 27 

 to 30 five or six mature flies came 

 forth." 



The fly proves to be a small species 

 of Sarcophaga. After considerable 

 time spent in looking over descriptions 

 of North American species, I feel justi- 

 fied in considering it new. 



Sarcophaga helicis n. sp. J . 



Eyes brown, bare; front, sides of face and 

 cheeks silvery or cinereous, sometimes with 

 a brass}' reflection; frontal vitta dark brown 

 or blackish, about one-third width of front, 

 the front being about one-third width of 

 head ; frontal bristles descending a little be- 

 low base of antennae; the two vertical bris- 

 tles strongest, directed backward, next three 

 bristles also directed backward, rest more or 

 less forward ; two orbital bristles directed 

 forward ; a strong anterior pair of ocellar 

 bristles directed forward and outward ; sides 

 of face with a few bristles in a row on lower 

 portion next orbital margin ; cheeks about 

 one-fourth eve-height, sparsely hairy with a 

 row of bristles on lower border; facial de- 

 pression more or less silvery, epistoma 

 rather prominent; facial ridges bare except 

 two or three bristly hairs next vibrissae, the 

 latter decussate and inserted on the oral 

 margin ; antennae a little shorter than face, 

 black, second joint slightly elongate with a 

 long bristle on front border, third joint 



