264 Trans. Acad. Sci. of St. Louis. 



gate than in any of the American genera, and the neck is cor- 

 respondingly narrower, though much wider than in Bolito- 

 chara. The genus Ditropalia is founded upon the European 

 JBolitochara bella Mark., obliqua Er., 'inulsanli Shp., and 

 other allied species and appears to be confined to the palae- 

 arctic fauna, 



Phymatura J. Sahib. — The single known representative 

 of this genus appears to be a somewhat rare insect. It greatly 

 resembles our Silusida and Venusa in its broad prothorax, 

 but differs very much in its shorter and more triangular meso- 

 sternal process, which is very broad at its base but acutely 

 rounded^at tip, differing from the corresponding part mBoli- 

 tochara also in the absence of any trace of carina. The type 

 is brevicollis Kr. 



Stictalia n. gen. 



The species of this genus are numerous but rather closely 

 allied among themselves, inhabiting various parts of the region 

 immediately contiguous to the Pacific Ocean, from southern 

 California to Alaska. They are smaller and much less con- 

 spicuous than the less numerous and, in all probability, in- 

 dividually less abundant species of the European genera Boli- 

 tochara and Ditropalia, and are intermediate in some char- 

 acters between those genera and Venusa and the European 

 JPhyniatura, having the gradually enlarged antennae of the 

 former and the sculpture of the latter. The coloration of the 

 abdomen seems to be constant, enabling us to separate the 

 species into two unequal primary groups as follows: — 



Abdomen pale, with a large subapical black cloud, the dark coloration gen- 

 erally extending to the base of the abdomen along the median basal 

 parts of the tergites 2 



Abdomen black throughout, the tergites toward base paler along their 

 apical margins especially toward the sides 8 



2 — Pronotum impressed at each side of the median line toward base, the 



impressions transversely connected slightly before the basal margin., 3 



Pronotum with a short transverse impression before the basal margin but 



not otherwise impressed 7 



3 — Fourth antennal joint only very slightly longer than wide 4 



Fourth antennal joint much elongated 6 



4 — Three basal tergites deeply impressed at base, the impressions notably 



