20 PROCEEDINGS OF THE NATIONAL MUSEUM vol.78 



7. ACHAETONEURA DIMMOCKI, new species 



Front at vertex in male 0.30, in female 0.33 the head width ; inner 

 eye margins moderately divergent, a little more so in male than in 

 female; front and face cinereous, the latter subshining and bearing 

 several strong bristles outside of frontal row ; frontal bristles variable 

 in number and strength; frontal vitta broad, light-brown as are the 

 eyes, and measuring about one-third width of front. Antennae in 

 both sexes four-fifths the face, third joint black, the second brownish, 

 in male about five times and in female three times the length of the 

 second ; arista thickened on basal half and tapering therefrom ; facial 

 ridges bristly about one-half way (weakly); palpi yellow; bucca 

 one-eighth eye height. 



Thorax black, gray pollinose, chaetotaxy as in frenchii. Scutellum 

 brownish, black at base, and bearing three pairs of marginal bristles 

 besides the decussate apical pair which lie either horizontally or up- 

 wardly directed. Disk with one pair of widely separated bristles 

 which arise near the middle. 



Abdomen black, gray pollinose, the pollen thickest in a narrow 

 band at bases of segments two and three. Segments one and two each 

 with a pair of marginal bristles, third with a marginal row of strong 

 bristles, as long as the fourth segment and longer than any of the 

 bristles thereon. Last segment bristly on its apical half ; abdominal 

 hairs of male erect, in female many erect short bristles or hairs ex- 

 tending along the dorsum of the abdomen which are in sharp contrast 

 to the adjacent depressed hairs. 



Mid tibiae with three or more strong bristles on the outer front 

 side near middle. Hind tibiae evenly but not densely ciliate with one 

 longer bristle. Front pulvilli of male longer than the last tarsal 

 joint. 



Wings with normal venation. 



Genitalia apparently as in frenchii complex. 



Length, 7-8 mm. 



Described from two males and three females collected on Rhus 

 copalUna^ June 5, 1898. Labeled " Springfield, Mass., G. Dimmock." 

 The specimens bear the numbers, " 1346— 1346a^l3466— 1346(f— 

 1346^. Also, one male and two females labeled, " bred from Hyfer- 

 chira io., Tatham, Mass., July 15, G. Dimmock," numbered " 1516& — 



Type.— Male. Cat. No. 43051, U.S.N.M. 



8. ACHAETONEURA ARCHIPPIVORA (Williston) 



Tachina archippivora Riley, 3d Rept. Ent. Mo., p. 150, 1871 (no description or 



figure). 

 Masicera archippivora Wiluston, Scudder's Butterflies of New England, vol. 3, 



p. 1923, 1889. 



