ART 18 DIPTERA OR TWO-WINGED FLIES ALDKICH 27 



uniform breadth to the tip, where the hind edge curves forward to 

 form a sharp tooth at the middle of the apex; accessory plate red- 

 dish, triangular, the apical side broad. Posterior clasper small and 

 inconspicuous, anterior clasper long and low, rounded at tip. Penis 

 thick and rather short, the distal segment globose, blackish; the 

 apical posterior part is suddenly narrowed into a curved beak ex- 

 tending forward, underneath which two blunt filaments emerge; the 

 side pieces of the distal segment are in the form of truncated plates, 

 diverging apically from each other. Fifth sternite yellow, retracted, 

 apparently a plain V. 



Legs black ; middle femora with combs before and behind at tip ; 

 middle tibiae with two bristles on outer front side; hind tibiae with 

 long villosity on outer and inner flexor sides. Claws and pulvilli 

 large, the latter infuscated. 



Wings hyaline ; third vein at base with four to six hairs ; bend of 

 fourth vein with stump or heavy fold; third costal segment con- 

 siderably longer than fifth ; no costal spine. 



Length 11 mm. 



Described from one male specimen, reared by F. Johansen from a 

 larva taken near Ottawa, Canada; the fly emerged July 11, 1918. 



ry;>e.— Male, Cat. No. 27098, U.S.N.M. 



The species is close to pulla Aldrich, but differs in the genitalia, 

 especially the form of the accessory plate, which is entirely different, 

 and in the forceps. 



SARCOPHAGA SUBAENESCENS, new species 



Fig. a. 



Male. — Front 0.21 of head width (one specimen) ; parafrontals 

 much narrower than median stripe, metallic above, thinly white 

 pollinose below; frontal bristles ten, the uppermost reclinate and 

 somewhat larger, the lowest diverging toward eye ; a single vertical ; 

 ocellars normal; parafacials with thin white pollen, quite narrow 

 below, the usual row of hairs bristly below; antennae black, third 

 joint reddish basally, over twice the second, arista with somewhat 

 short plumosity extending only to middle. Palpi black; bucca 

 hardly one-third eye height, with black hair; back of head with only 

 a little pale hair about foramen and below. 



Thorax thinly glaucous pollinose, subshining, but when viewed 

 from behind showing the usual three dark stripes well separated. 

 Acrostichal 0, 1 ; dorsocentral 2, 3, sternopleural 3 ; scutellum Avith two 

 lateral, one apical, and one discal ; postalar declivity with a few hairs 

 in middle. 



Abdomen black with very thin tessellation, subshining and with a 

 slight aeneous reflection; first segment without median marginals; 



