462 Report of the Department of Entomology of the 



and have a narrow dark band near the base, a broad one across 



the middle, and a broad one near the tip. The hind wings are 



extremely narrow. 



The antennae of 



the female are 



about half the 



length of body and 



are 9-jointed, the 



last joint being 



the largest. The 



antennae of the 



male are filiform, 



longer than the 



body and are 13- 



jointed. (Fig. 27, 



a.) 



A number of 



eggs of nigricornis 



„,„,„ avam i na A ™ Fig. 27.— Adult Female of Polynema bifascialipcnne. 



Were examined on A Antenna of male. 



July 22, 1912, and 



some of them which remained unhatched contained larvae of a 



parasite which proved to be Cacus 

 acanthi. The larvae were about full 

 grown and measured 2.3 mm. in 

 length by .5 mm. in diameter. (Fig. 

 28, a.) The body is made up of eleven 

 segments, each of which, except the 

 last, has two rounded protuberances 

 on each side, while segments 2 to 7 

 inclusive have a pair of small but 

 prominent protuberances on the dorsal 

 side. The margins of the segments 

 are elevated, especially on the sides 

 of the body. The color is generally 

 a translucent white, but segments 2 to 

 A B 6 inclusive appear yellowish, due 



Fig. 28.— Cacus acanthi: a, larva; apparently to some internal organ. 



The pupae were formed near the end 



of July. (Fig. 28, b.) They were white at first but later turned 



black and had ail the characters of the adult. On September 5, 



