339 



right, and are slightly bent caiidad near apices, several of the thorns 

 being occasionally l)ifid apically ; segments 2 to 7 each with a median 

 transverse series of thorns which alternate in size, the shorter ones 

 being generally stouter and very often bifid on middle portion of 

 series ; eighth segment with a much weaker transverse series than the 

 others; posterior to the spiracle on first segment is a series of from 6 

 to 8 long hairlike bristles; spiracles conspicuous, raised, reniform; 

 armature of ventral segments consisting of a transverse series of weak 

 closely placed hair-like bristles at apical third of each segment except 

 the eighth, which has a series on each side at middle extending from 

 lateral margin halfway to median line ; ventral surface without rugae, 

 apical segment as in Figure 15. 



The foregoing description was drawn from specimens found by 

 W. P. Flint, of the State Entomologist's office, in a garden at Spring- 

 field, 111., August 6-8, 1915. One specimen of each sex was reared. 



Imagines of this species are in the collection here from Grand 

 Tow-er, Murphysboro, and St. Francisville, the dates ranging from 

 July 25 to August 2. I took a single specimen on the south campus of 

 the University here August 28, 191 5. 



Proctacanthus milberti Macquart ? 



Proctacanthus milherti Macquart, Dipt. Exot., Vol. 1, Pt. 2, 1838, p. 124. 



Pupa. — Length, 25 mm. Pale yellowish brown. Armature of 

 head similar to that of PromacJms vertebra tus, differing in having the 

 pair of anterior, forwardly directed thorns smaller and more widely 

 separated at base and the lateral trifid process without distinct angle 

 on base of lower thorn (PI. LXXXII, Fig. 6). The pair of thorns at 

 base of posterior leg sheath (PI. LXXXII, Fig. 7) are longer and 

 more slender than in vertehratus; the tubercle on base of wing sheath 

 is absent, and a single wart is present on the sw^elling on middle of the 

 sheath. First abdominal segment with a transverse series of long slen- 

 der spines, about 18 in number, which are directed slightly forward, 

 their points slightly recurved, the series occupying two thirds of the 

 length on each side between the median line and the spiracle ; between 

 some of the long spines there is sometimes a smaller spine ; posterior 

 to the first spiracle are about 7 long hairs (Fig. 22) — 3 in Asiliis no- 

 tatiis and Pro-uiachus vertcbratus; segments 2 to 7 each with a trans- 

 verse median series of long slender spines alternating with shorter 

 stout thorns which are single, bifid, or paired (Fig. 19) ; eighth seg- 

 ment with a transverse series of spines which are of irregular sizes and 

 unevenlv arranged ; apical segment with a long slender upwardly 



