348 THE CANADIAN ENTO^fOLOGIST. 



e) Diglochis. 



ee) Metacarpus radio brevior vel sequalis. 



f) Abdomen oblongum. 



g) Vertex medio teres. Abdomen 9 ovatum, subtiis convexum. Alae 



9 ssepe macula magna disci fumata. Antennae 9 clava parva 



pedicello breviore Arihrolytus. 



gg) Vertex medioacuto Dibrachys. 



ii) Abdomen rotundum. Genae compresso-acutae. Ala vitreas, metacarpo 



radio breviore Coelopisthusr 



(Thomson, 1878, pp. 146-147.) 

 The description of the genus is given later, on page 158, in the 

 following words : 



"Subgenus ARTHROLYTUS. 

 Caput vertice medio baud acuto, oculis sat magnis, ovatis, convexis 

 glabris, clypeo apice truncto, mandibulis minus validus. Collare baud 

 discretum. Alse metacarpo radio vix longiore, disco $ ssepe macula 

 magna fumata. Abdomen ovatum subtus convexum. Antennae clava $ 

 parva. Pedes crassi. 



Detta subgenus afviker fran Diglochis genom kortare metacarpus och 

 annelli, mer eller mindre incrasserade antenner, iiggformig abdomen hos 

 ? och oftast aftrindadt pronotum.* 



A) Antennae minus validae sec fl^gelloincrassato, ^ articulis longis 

 hirtis, infra medium faciei convexae inserts?. 



E, A. ptnictatus m : . . '. 



B^ Antennae flagello valido longe infra medium faciei protuberantis 

 insertae. Abdomen segmento ultimo spiraculis ab apice longe 

 remotis. 



2. A. aibiscapiis m : 



C*^ Antennae flagello baud valido sed incrassato. i\lae immaculatae. 



a. This subg-enus differs from Diglochis through the shorter (kortare ) post- 

 marginal vein .' nd ring-joii.ts (a7ineli), the more or less incrassale antennae, 

 •egg-shaped abdorren in the female and the u ually (most often, oftast) rounded 

 f aftrindadt ) prcnotum. 



b. Page 159. 



c. Page 160. 



