25 



a siugle female specimen collected at New Orleans, La. (June, 1867, 

 Trans. Am. Ent. Soc, p. 20.) 



Fig. G.—Schizocems privatus : a, portion of leaf sliowing arrangement and appearance of egg-sacs ; 

 6, portion of same more enlarged, with escaping larvse ; c, newly-liatclied larvse ; d, female fly , e, antenna 

 of male; all enlarged except a (original). 



The insect has hitherto been a very rare one, and in fact the male of 

 it has never been described. In a collection of Tenthredinid^e, recently 

 received at the Department for determination from the Michigan Agricul- 

 tural College, were a number of specimens of both sexes of this species, 

 taken in Michigan; and there is a specimen, bearing the locality label 

 "]S'ebraska," in the collection of the American Entomological Society 

 of Philadelphia. 



The female (Fig. 6 d) is nearly twice the size of the common house- 

 liy, and is shiningblack, including the legs, except the basal joints (coxie 

 and trochanters) of the hind pairs ; the abdomen is reddish yellow, includ- 

 ing also the lateral and ventral portion of the metathorax. The wings 

 are very smoky, almost opaque. The antennae of the female is simple and 

 consists of three joints, of which the last is very long; in the male this 

 last joint is bifurcate, as shown at e. The male is also considerably 

 smaller than the female, and differs from the latter still further in being 

 entirely black except the legs, which are whitish in part. In coloration 

 this species is almost identical with ^S. ebenus^ except that in general 

 the colors are brighter and more sharply defined in the former. The 

 female is, however, more than twice the size of the latter . species and 

 nmch more robust, which differences also hold true, but to a less extent, 

 in the case of the males of the two species. Other important differences 

 may be noted as follows : 



As compared with ebenus^ the head of privatns is much less trilobate 

 when viewed from above ; the antennai of the female are more filiform 



