THE CANADIAN ENTOMOLOGIST. 2G3 



head pale brown or yellowish, with a dark area ventrad of the base of each 

 antenna, and with less deep mottlings elsewhere, part of which border and 

 delimit a narrow median pale stripe. Antennae brown, with the last two 

 articles commonly darker. 



In the female the body is narrowed from the posterior region, 

 cephalad to the sixth and seventh segments, where it is narrowest, again 

 widening from there to the head. In the male the body is narrowed, both 

 caudad and cephalad, from the middle region. 



A sharply impressed median longitudinal line extends about half way 

 across the vertex ; from its anterior end two less sharply impressed lines 

 diverge forward and outward, one running to the socket of each antenna. 

 Vertes granulate. Frons and clypeus clothed with rather short setose 

 hairs of uniform length. 



Antennce long ; clavate, the penult article large ; subdensely hirsute. 



First dorsal plate clearly narrower than the head, inclusive of genae. 

 Anterior margin semi-circular ; from each carina the margin runs caudo- 

 mesad in a straight line to the mesal transverse portion, which is straight. 

 An impressed line or sulcus parallel with the anterior margin and behind 

 the first row of tubercles. Depressed along the median longitudinal line. 

 Carinal and caudo-lateral borders distinctly margined. Tubercles strongly 

 developed ; arranged in about eight transverse rows. Carinae each 

 incised, producing two blunt teeth, of which the caudal is the larger ; on 

 the margin cephalad of the anterior one a number of much smaller denti- 

 culations, some of which become obscure. 



Second dorsal plate with the lateral portions bent strongly cephalad ; 

 but remaining free from the first plate. Cephalo-lateral angle rectangular 

 in outline, but well rounded ; on its anterior or antero-mesal side a minute 

 or almost obscure denticulation, and just caudad on the lateral margin a 

 distinct acute tooth, which is succeeded by five others, which become 

 wider and lower in going caudad on the lateral margin, and three low 

 teeth or crenations on the caudal margin. Carinae sub-horizontal or a 

 little elevated, the intercarinal portion of segment, as in subsequent 

 metameres, strongly convex. Tubercles on all segments strongly and 

 distinctly developed. Transverse sulcus distinct over the median portion. 



Third dorsal plate very similar to the second, less strongly bent for- 

 ward at the sides. Carinal margin a little shorter. Teeth very similar, 

 but the anterior denticulations more distinct, and those of the caudal 

 margin more strongly developed. 



Fourth dorsal plate like the third ; but the carinal margin longer and 

 the teeth of the caudal margin still more strongly developed. 



