PROC. ENT. SOC. WASH., VOL. 20, NO. 4, APR., 1918 85 



the punctuation of the head and thorax, especially the scutellum; 

 the shape and relative length and width of the postocellar area; 

 the hypopygidium of the male, etc. 



There are a number of undescribed species in this genus but 

 the tabulation and description of all of these must be held for a 

 more complete paper. Some of the species, however, are abundant 

 and have attracted the attention of economic entomologists. 

 Descriptions of some of these follow. 



Neodiprion (Neodiprion) dyari, new species. 



Structurally this is close to fabricii (Leach) but it feeds on a 

 different pine in the larval stage, is much darker and has a dif- 

 ferent habitus and sheath. 



Female. Length 7 mm. Labrum polished, obtusely pointed apically; 

 clypeus nearly truncate, with a narrow depressed margin, punctured like 

 the rest of the front; supraclypeal area flattened; antennal foveae poorly 

 defined, connected with the deeper supraclypeal foveae, lateral foveae 

 wanting or nearly; middle fovea shallow, very poorly defined; ocellar basin 

 wanting or only faintly indicated; postocellar area flattened, well defined, 

 not widened posteriorly, about two and a half times as wide as the cephalo- 

 caudad length; postocellar line longer than the ocellocular line; head 

 closely punctured, the punctures more separate on the vertex; antennae 

 twenty-jointed, tapering, pedicellum twice or more than twice as wide 

 as long, third joint longer than the fourth, apical joints about two and a 

 half times as long as broad; mesonotum sparsely punctured, punctures of 

 scutellum somewhat larger; mesepisternum more closely punctured than 

 the scutum; first perapteron, in outline, nearly an equilateral triangle; 

 tergum shining i:r punctate venter with separate poorly defined punctures; 

 last sternite broadly arcuately etnarginate; apical ventral pad-like por- 

 tion of sheath about five times as long as broad, separate from the middle 

 portion; wings and legs normal. Piceous; spot on mandibles, spot on 

 malar space, clypeus and band on vertex reddish-yellow; pronotum, mar- 

 gins of pres-iitum, large spot on scutellum, pleurae, middle of venter, 

 ventral aspect of tergum, and legs evept the brownish bases of coxae 

 and most of the femora, pallid. Wings iridescent, hyaline, slightly dusky; 

 venation rather dark brown, stigma p'lle brown. 



Paratopotypes show this species to vary as follows: antennae nineteen 

 to twenty-jointed; clypeus with ;i broad, shining depressed margin : head 

 ferruginous, with a broad piceoiis front:il band, to piceous (the typical 

 color is the commonest) femora brownish to ferruginous; posterior tibiae 

 sometimes piceous; mesepisternum and scutellum sometimes piceous; 

 abdomen castenous to typical. 



Mule. Length G mm. Labrum punctured, narrowly rounded apically; 

 clypeus broadly arcuately emarginate, apical part more shining than the 

 basal; foveae and punctuation as in female; postocellar area subconvex, 



