February, '15] ALDRICH: SARCOPHAGA UTILIS 151 



A NEW SARCOPHAGA PARASITIC ON ALLORHINA 



NITIDAi 



By J. M. Aldrich, Assistant in Cereal and Forage Insect Investigations, U. S. Bureau 

 of Entomology, Lafayette, Ind. 



The publication of the following new species is desired in order that 

 it may be referred to in a forthcoming article on the host. 



Sarcophaga utilis new species. 



cf . Robust black species "vsdth first vein bare, dorsocentrals much reduced and 

 hardly differentiated except the hindmost two pairs, no acrostichals except the 

 prescutellar pair, hind tibiae not vdih long, erect viUosity; and hypopygium red 

 except for an indistinct blackish band across the middle of the first segment. 



Head broad, the front at narrowest equal to | of one eye, black above, the frontal 

 stripe wide, black; lower part of the parafrontals together with the parafacials and 

 anterior part of bucca rather grayish-yellow pollinose, a darker reflecting spot later- 

 ally from root of antennae; beard mixed black and yellowish; bucca about haK the 

 eye-height in profile view; proboscis ordinary, palpi black; vibrissae inserted weU 

 above oral margin, almost on a level with lower edge of eye. Outer vertical bristle 

 well developed, almost hke inner; three fairly regular rows of black ciHa behind the 

 compound eye; parafacials less than half as wide as median portion of face, with an 

 obUque row of small bristles close to orbit and a few scatter- 

 ing; antennae entirely black, third joint rather short and 

 wide, twice the length of the second; arista loosely plumose 

 for three-fifths of its length. 



Thorax black, gray-pollinose, with the usual three black, 

 sub-shining stripes, of which the middle one broadens out 

 on the scutellum and is accompanied anteriorly by a fine line 

 each side; another pair of stripes on the sides of the meso- 

 notum, abbreviated in front, extend to the metanotum; 

 pleurae lightly pollinose, mostly blackish; scutellum large, 

 with only two lateral pairs and a smallish apical pair of 

 macrochaetae, together with a medium-sized subdiscal pair; 



halteres yellow, the stem and base of knob brownish; Yig. 9. Sarcophaga 



calypters white. ^^^n^ sp., male gen- 



Abdomen gray-pollinose with the usual tessellated appear- italia. 

 ance, when viewed from behind showing three longitudinal 



blackish stripes; the hind margin of the fourth segment red in ground color; second 

 segment without median marginal macrochaetae, third with a single pair, fourth 

 with a row of about 18 across the dorsum. 



The hypopygium normally retracted is rather large, red, the first segment more or 

 less blackish on the base of the exposed part (really the middle), without row of 

 bristles apically; second segment red, globose, with long blackish hair, more dense 

 about the forceps. When unfolded the gemtaHa usually (in seven of eight examined) 

 have the terminal part of the penis enveloped in a gelatinous mass, so that its structure 

 cannot be made out; the accompanying drawing is made from a specimen that had 

 been boiled in water, which successfully freed it from this substance. The long, 

 abundant, backward-directed hair is omitted from the main part of the forceps. 

 The drawing was made shortly after boiling, while the specimen was plump, but it 



^ Published by permission of the Chief of the Bureau of Entomology. 



