THE CANADIAN KNTOMOLOtUST. 231 



Median line of thorax wanting, punctures 



finer testacea, Kirby. 



AA. Thorax with deep median groove, disk punctured in an even space 

 each side albicollis, Burm. 



Macrodactvlus, Latr. 



The "Rose-bug," M. siibspinosus (Fig. 25), is the only recorded 



Canadian species of this genus, and is probably too well 



%j^ known to need an extended description. It is an elongate 



JMtS, insect (about .35 inch) with very long and slender legs, the 



]^\ body covered with ochreous scales to the extent of obscuring 



the real colour. The thorax is very long and angulate on the 



f^'s- 25- sides. 



Serica, MacLeay. 



Two species are recorded from East Canada. They are robust convex 

 insects of rather small size (.35 to .42 inch),, broader behind, giving them 

 a very characteristic appearance. The species fly chiefly in the evening, 

 and during the day may be found under leaves in the woods. They are 

 easily separated thus : 



Body not iridescent, clypeus with a small acute incisure each 

 side vespertma, Gyll. 



Body iridescent, clypeus without incisure ..sericea, 111. 



DiPLOTAXis, Kirby. 



These beetles are easily known from Serica, to which they bear 

 some resemblance, by the elytra not being sulcate, but either simply 

 punctate or with the punctures arranged in rows, the rows in pairs. The 

 wider interspaces are irregularly punctured ; the body is less convex and 

 less dilated posteriorly than in Serica. The species of the region under 

 consideration may thus be known : 



A. Body pubescent, elytra without distinctrows of punctures.. j^r^/Z^a, Say. 

 AA. Body not pubescent above, elytra distinctly punctate-striate. 



Thorax with scattered punctures, leaving smooth spaces near the 



middle liberia, Germ. 



Thorax densely and more finely punctured ...tristis, Kirby. 



Lachnosterna, Hope. 

 This genus, formerly in confusion in all cabinets, has lately had the 

 attention of Dr. Horn, who has developed characters that may be 



