389 



spiracles large, slightly elevated; first dorsal segment with 14 long, 

 slender, upwardly directed thorns, the apices of which are slightly 

 deflected backward ; segments 2 and 3 each with 6 long, slender thorns, 

 between the middle and outer pairs of which, in each series, are 2 

 very short, stout thorns, and between the other pairs 1 such thorn, 

 while laterad of the outermost large thorn on each segment are 4-5 

 short thorns and 4-6 long stout bristles; segments 4-7 each with 6 

 long spines as on 2 and 3, but the intervening short thorns are, except 

 between the middle pair, reduced to 1, and those on lateral areas are 

 also reduced in number until on segment 7 there are only 2 thorns 

 and 4 bristles laterally; eighth segment with 1 spine and 1 bristle 

 close to lateral margin well distad of transverse median line ; arma- 

 ture of each side of apical segment consisting of a strong upwardly 

 and backwardly directed thorn, the apex of which is slightly deflected, 

 a moderately large median lateral thorn, and a small thorn on postero- 

 ventral margin (Fig. 9) ; postspiracular area of first segment with 3 

 bristles, number on other segments 4-6; ventral segments each. with a 

 continuous transverse series of bristles near posterior margin, that on 

 seventh segment consisting of about 24, and slightly caudad of 

 the latter series is a pair of much stronger bristles, one on each side 

 of median line. 



The foregoing description is drawn from the pupal exuvium of 

 a male submitted by J. A. Hyslop, of the U. S. Bureau of Entomology 

 (Accession No. 2265). 



The species is represented in our collection by imagines from Al- 

 gonquin, Grafton, Ouincy, Urbana, and Mt. Carmel — all in Illinois; 

 and from Delaware Co., Pa., and from Kansas. 



The larvae are predaceous upon white-grubs. 



Family BOMBYUWAB 



FAMILY CHARACTERS 



Larva (PI. LVI, Fig. 1). — Very few of the species of this family 

 are known or described in the larval stage, and the short characteriza- 

 tion that is given here will in all probability require considerable 

 modification to cover the entire family. The young larva of 

 Bombylius pumilus has been described by Nielson*, and differs very 

 markedly from the mature form, being very active, and armed with 

 thoracic and anal hairs, which are absent from the latter. Through- 

 out this paper I have dealt only with last-instar larvae, and this point 



*Zool. Jahrb., Abth. Gcogr. u. Biol., Vol. 18, 1903, p. 647. 



