58 MISCELLANEOUS FOEEST INSECTS. 



SECTION a4. 

 (Species Nos. 18 to 28.) 



Adults. -^^SiSSil an<:;les of pronotum rounded; beak slender and 

 moderately to very long. 



Species 18 to 24 have the punctures of the pronotum distinctly 

 separated and the punctures of the elytral stria; small to coarse. 

 In species 18 to 21 the pronotum is not distinctly narrower than the 

 elytra. Species 18 has a short, stout pronotum with the sides 

 strongly rounded and constricted toward the anterior margin, 

 the elytral interspaces with rather coarse rugosities. Species 19 to 

 21 have a more elongate pronotum with rounded sides but not dis- 

 tinctly constricted toward the head, and the elytral interspaces 

 have fine rugosities. In species 22 to 24 the pronotum is distinctly 

 narrower than the elytra. Species 25 to 28 have the punctures of 

 the pronotum irregular in size and not distinctly separated and the 

 strial pvmctures are very coarse and irregular. In species 25 and 26 

 the strial punctures are very irregular in size, the elytral spots 

 moderately distinct, and the pronotum not distinctly narrower than 

 the elytra. In species 27 and 28 the strial punctures are moderately 

 irregular, the elytral spots are evident but small, and the pronotum 

 is distinctly narrower than the elytra. 



Sexes. — In species 18 the apical margin of the seventh abdominal 

 sternite of the males is sinuate but without median process, while 

 in species 20 there is a distinct median process, and in species 25 to 

 28 the apex is uniformly rounded as in the females. 



Pupse. — The fourth and fifth abdominal tergites have two small 

 spines between the more prominent dorsal ones. In species 26 the 

 rostrum is without a pair of spines between the middle and apex, 

 while in 27 they are present. Head without distinct eye spots (so 

 far as observed). 



Larvse. — In species 18 the abdominal spiracles are moderately 

 distinct, the apical tooth of the mandibles obtuse, and the median 

 tooth triangular. In species 20 the apical tooth is acute, and the 

 median tooth is emarginate. In species 26 to 28 the abdominal 

 spiracles are obscure. In species 26 the apical tooth is acute and the 

 middle tooth triano-ular. In species 27 the apical tooth is acute 

 and the median one emarginate, while in species 28 the apical tooth 

 is obtuse and the median one emarginate. 



Hosts. — Species 18, 19, 20, Picea; species 21, Pinus; species 22, 

 Picea; species 25, 26 and 27, Abies. 



Distribution. — Species 18, 19, 20, and 28, Canadian zone, West 

 Virginia and New Hampshire; species 21 and 26, Cascade Mountains, 

 Oregon and Washington; species 22 and 25, central Rocky Mountains; 

 species 23, Alaska (Arctic Circle); species 24, northern Michigan; 

 species 27, Maine to northern Michigan. 



