379 



pairs of thorns; following segments with similar armalure except 

 that there are 6 thorns, which are gradually reduced in strength until 

 on the eighth segment they are very short and not much stronger than 

 the long intervening hairs; lateral extremities of the transverse arma- 

 ture as on first segment ; spiracles minute ; postspiracular area of 

 each segment with 4 long hairs ; ventral segments each with 3 long 

 hairs in a transverse series on each side; apical segment rounded, the 

 terminal processes very small. 



The foregoing descriptions are drawn from the exuvia of a male 

 specimen reared by the writer. The larva was obtained at Cotton- 

 wood Grove, Urbana, 111., April 23, 1916, in ground under a rotten 

 log in company with several other dipterous larvae. It pupated May 

 5, and the imago emerged May 19. The specimen is a male, 1 1.5 mm. 

 in length, which is a considerable increase over the 7 mm. of the pupa. 

 No data were obtained as to the food of the larva. 



The imagines of this species are not uncommon in Illinois. 



Ceraturgus Wiedemann 



I have before me larval and pupal exuvia of one species of this 

 genus, and describe the species herewith. The larval and pupal stages 

 have not been known hitherto. 



GEJNERIC CHARACTERS 



Larva. — I have before me only the cast skin of a larva which, with 

 the exception of the head, is in very poor condition. It is not possible 

 for me to discover the structure of the body, but the head is very 

 similar to that of the larva I have considered as belonging to Dasyllis, 

 the principal difference lying in the much less evident notch in the 

 maxilla. 



Pupa. — Separable from any other genus in the family that is 

 known to me bv the presence of 5 thorns on each antennal sheath. 

 There are no small thorns on sides of face as in Laphria. 



Imago. — The imagines of this genus are A^ery robust insects, and 

 their build, together with the long and dense black and yellow thoracic 

 and abdominal hairs, gives them much the appearance of small bumble- 

 bees. Thev are predaceous, feeding upon a large variety of insects, 

 including bees. 



Ceraturgus cruciatus Say 



Dasi/pogon cruciatus Sar, Jour. Acad. ISTat. Sei. Phila., Vol. 3, 1823, p. .52. 



Larva. — Head flattened, the portion which is protrusive somewhat 

 shield-shaped (PI. LV, Fig. i) ; maxillae not very acute at apices, the 



