396 



WEST VIRGINIA EXPERIMENT STATION. 



and smooth dorsal line usually distinct; elitra, with 

 obscure rows of punctures, the interspaces rough- 

 ened with irregular, transverse, shining elevations, 

 coarser and more oblique at and near the base. In some 

 examples the inter- 

 spaces are nearly smooth; 

 and in some the sur- 

 face is clothed with 

 long and short hairs, 

 while in others the hairs 

 are obscure or absent. 

 Easily recognized from 



., ., . , Fig.L'K.Dendroctonusfrontalis. a, tibia: b. tar 



the Other Species Dy Its sus;c, antanna;rf, club lateral view; e, dab front 



surface ; /, mentum ; g, maxilla. 



smaller size. 



The egg. Fig. LIX/, Length 7 mm.; width, 5 mm.; pearly 

 white and shinning. 



The larva. Fig. LIX d. Directly after emerging from the 

 egg, the body of the larva is much curved so that the outline 

 forms a circle about 5 mm in diameter, Fig. LIX, e ; the head is 

 large and the mandibles stout and dark. The head and last 

 abdominal segment are clothed with a few long white hairs. 



The matured larva is from 5-7 mm. long; the body nearly 

 straight; head, large, reddish, with frontal elevation or tubercle 

 and a few long hairs; mandibles reddish black and with ob- 

 scure antennae in depressions just above the base. The body 

 is divided into thirteen segments, the first three or thoracic 

 segments, large, especially the ventral portion which extend 

 beyond the tip of the mandibles; last segment truncate and 

 clothed with a few long hairs. Described from alcohol speci- 

 mens and sketched from life. 



Pupa. Length, 3 - 4.2 mm. Distinguished by I he large head 

 and prothorax which closely resembles that of the adult ; also 

 by the fleshy tubercles and spires on the posterior edges of the 

 2d to 7th abdominal segments as viewed from above or the 

 side; also by two long fleshy spires on the rounded ventral 





