387 



longer from first to seventh segment, and the short thorns progres- 

 sively shorter and less numerous; laterad of the outer long thorn on 

 each segmient are i or 2 short thorns and from 4 to 7 long bristles; 

 eighth segment with 4 short, stout thorns; postspiracular area of first 

 segment with 7-8 bristles; ventral segments up to and including 7 

 each with a continuous transverse median series of closely placed 

 bristles, the median pair appreciably stronger than those on either side 

 of them ; eighth segment with a pair of stout bristles on each side of 

 disc; upper pair of thorns on apical segment long, tapering, directed 

 backward and slightly upward ; median pair not half as large as upper, 

 ventral pair short (PI. LV, Fig. 10). 



The foregoing description is drawn from the pupal exuvium of 

 a female obtained at Saratoga Springs, N. Y., June 8, 191 5, and kind- 

 ly submitted by Dr. E. P. Felt. 



The species is represented by imagines from Algonquin and Al- 

 bion, 111. ; and from Hot Springs, Ark. 



The habits of the larvae are imknown to me. 



Erax maculatus Macquart 



Erax maculatus Maequart, Dipt. Exot., Vol. 1, Pt. 2, p. 111. (1838) 



Erax lateralis Macquart, ibid, p. 116. 



Erax amhifjuus Maequart, ibid, Suppl. 1, p. 84. (1845) 



Asilus interruptus Macquart, Hist. Nat. Dipt., Vol. 1, p. 310. (1834) 



Pupa. — Length, 20 mm. Yellowish testaceous, slightly shining; 

 cephalic and abdominal armature glossy dark brown; apical portions 

 of mouth-sheath and of wings brown. 



Upper pair of cephalic processes stout, flattened and smooth above, 

 rugose basally, distance between apices of thorns slightly exceeding 

 length of either thorn; lateral processes consisting of 3 almost equally 

 long blunt thorns, the lower with a slight angle at base on under side 

 (PI. LV, Fig. 4). Thoracic spiracle very broad, slightly elevated, 

 reniform area smooth and slightly convex, margin carinate; the pair 

 of thorns at base of middle leg very short and stout, about twice as 

 long as their apical width (Fig. 5) ; protuberance above wing-base 

 with a slight but distinct tooth near its lower posterior margin ; wing 

 with a small, sharp, discal protuberance at middle; leg-sheaths with 

 a slight callosity near middle; apices of wings extending to midway 

 between apices of fore and mid tarsi, apices of tarsi carinate on cen- 

 ter of ventral surface. Abdominal spiracles broad, not twice as high 

 as breadth at middle, slightlv elevated ; transverse armature of first 



