THE CANADIAN ENTOMOLOGIST. 40 



NOTES ON TENTHREDINOIDEA, WITH DESCRIPTIONS OF 



NEW SPECIES. 



RY S. A. ROHWER, BOULDER, COLO. 



Paper VIII. — New Species from California. 

 Loderus tiiger, n. sp. 

 Male: Length, 7.5 mm. Anterior margin of the clypeus deeply 

 emarginate, the lobes broad and obtuse ; the labrum rounded at the apex, 

 punctured; the front rugoso-granular ; behind the ocelli the head is 

 shining and punctured ; the lateral ocellar furrows distinct to the lateral 

 ocelli, but not extending beyond them ; the supraorbital fovea large and 

 shallow, deeper at the orbits. Antennie rather stout, somewhat flattened, 

 the third joint very little longer than the fourth. The mesonotum and the 

 sculellum shining, rather sparsely ])unctured, the ]nmctures on the 

 anterior lobe more compact ; mesopleur^e anteriorly rugoso-punctured, 

 jjosteriorly tinely punctured ; pectus shining, with a few scattered punc- 

 tures. The basal abscissa of the cubitus strongly bowed downward, 

 otherwise the venation is normal : stigma broadest at the base, tapering to 

 the apex. Abdomen shining. Colour black ; in some specimens there is 

 a piceous spot at the apex of the anterior femora beneath. The head, 

 thorax and legs with white hair. Wings dusky, hyaline, iridescent ; 

 venation black. 



Female : The female differs from the male in being slightly larger, in 

 having the wings paler, and the stigma more rounded beneath. The 

 antennae are not so flattened ; the sheath is stout, the upper posterior 

 angle is sharp. 



Type locality : Mountains near Claremont, California. Males and 

 females collected by C F. Baker. 



This is very distinct from Loderus albifrons (Nort.), the only 

 other described Loderus know to occur in North America, by the en- 

 tirely black colour. In general appearance it is like the group sericeus 

 of Dolerus. 



Froiotaxomis, n. gen. — Clypeus distinctly emarginate ; antennal joints 

 three and four subequal ; ocellar basin evident ; the last two joints of the 

 maxillary palpi subequal ; malar space narrow but present ; the third 

 cubital cell broader below than above, due to the oblique transverse third 

 cubitus ] the second abscissa longer than the free part of M4 ; the cross 

 nervure of the lanceolate cell (free part of 2nd A) slightly oblique ; cell 



February, igio 



