THE CANADIAN ENTOMOLOGIST. 9 



argeniaia, the cotton moth ; both specimens were in perfect order, not in 

 the least rubbed or worn. In Oct., 1880, I took several specimens about 

 the city, also apparently recently emerged. 



TWO NEW SPECIES OF ISOSOMA. 



BY G. H. FRENCH, CARBONDALE, ILL. 



IsosoMA Allynii, n. S. 



Female. — Average length .10 of an inch. Color of body and antennas 

 uniform black, the first with a slight greenish lustre. Head about .025 of 

 an inch wide, about two thirds as long ; the antennae a little enlarged at 

 the ends, hairy, microscopic hairs moderately scattered over the head and 

 thorax. Thorax, as well as head, punctured ; wings hyaline, dotted over 

 with microscopic hairs, the thorax in its widest part about the width of the 

 head. Abdomen gradually tapering from near the base, the ovipositor 

 slightly exserted. The color of the legs vary slightly ; in five speci- 

 mens the anterior and posterior legs have the femurs fuscous except at the 

 ends ; the tibioe with basal half fuscous, the rest yellow ; the terminal 

 joint of tarsi fuscous, the rest yellow ; the middle pair of legs are yellow 

 throughout except the terminal tarsi. Two specimens have all the femurs 

 fuscous, yellow at the ends. One specimen has all the femurs pale red, 

 and the tibiae fuscous, but this is i)robably a change from yellow by the 

 poison bottle used in killing. One is marked like the first five, with the 

 yellow replaced by pale red ; another is like the first five, except that the 

 middle tibiae are a little clouded at base. 



Male. — In this sex the body, wings and antennae are colored like the 

 females, but the antennae are a little more slender at their ends. The 

 head and thorax have about the same measurements, but the abdomen is 

 a little shorter, the whole insect being from .06 to .07 of an inch. The 

 legs have all the femurs yellow, front tibiae yellow, middle and hind tibiae 

 fuscous, except at the apices, which are yellow ; feet as in the females. 



Larvae. — These are found inside stalks of growing wheat in Southern 

 Illinois, before the ripening of the grain, and in the straw and stubble 

 during the rest of the summer. They are found mostly in the interior of 

 the first and second internodes below the one supporting the head, usually 

 singly, but sometimes more than one in the same internode. They pro- 



