414 THE CANADIAN ENTOMOLOGIST. 



A NEW SPECIES OF DEROSTENUS (CHALCIDOIDEA). 



BY C. R. CROSBY, ITHACA, N. Y. 



Derosteniis sahitaris, new species. — Male. Length, 1,5 mm. Head, 

 thorax and abdomen bright metallic green, the last darker and bluish in 

 certain lights. Head viewed from above strongly convergent behind the 

 eyes and strongly concave posteriorly ; the occiput bounded by a distinct 

 ridge bearing a row of blackish hairs. Viewed from in front the inner 

 margin of the eyes sinuate. Antennae inserted near the mouth and 

 separated by a distinct median carina. Head finely shingled and clothed 

 with sparse, short, dark-coloured hairs. Eyes finely pubescent. 



Thorax more distinctly shingled and clothed with a few rather long 

 brownish hairs. Propodeum with a median carina and a transverse carina 

 before the apex ; no lateral carinae present. 



Antennae dark, nearly black ; scape white ; ring-joint distinct ; funicle 

 of three nearly equal segments ; club ovate, of three closely united seg- 

 ments, the last small and style-like ; flagellum filiform. Legs white ; 

 coxae metallic green. Wings hyaline ; postmarginal vem about as 

 long as the stigmal. 



Petiole of abdomen a little longer than hind coxae, finely and densely 

 punctate. Abdomen viewed from above nearly circular, smooth and 

 flattened. The first segment behind petiole about one-third the length of 

 abdomen, the others subequal. 



Described from two ^ specimens reared 2nd June, 1911, from 

 cocoons of the plum leaf-miner ( Neptiaila slmgerlandella Kearfott), from 

 Rochester, N. Y. 



The larva is 1.4 mm. long, smooth, whitish in colour, and rounded at 

 both ends. The mandibles are very small and inconspicuous. 



Mr. Heath's note on Fierts protodice, in the September number 

 (p. 327), records just such an experience as I myself had this summer^ 

 On July 25, while hunting in my own grounds, I perceived a white butter- 

 fly which seemed to*be different from the cabbage butterflies that were 

 flying about. 1 netted it, and iound it to be F. protodice — the first 1 had 

 ever seen in this neighbourhood, where I have been collecting since 1907. 

 On Aug. 2T, in some pasture-fields near this town, I found numbers ci 

 protodice mingling with the crowds of rapce. 1 at once captured two, 

 male and female, and could have taken a dozen with ease. — Frank ]\L 

 Gibson, Ph.D., Westminster, Maryland, 12th September, 191 1. 



