HOW TO KNOW THE IMMATURE INSECTS 



106b. Cerci with a branch at base. Fig. 306. 



Fig. 306. a, Eurygenius companulotus Lee. 

 9th abdominal segment with cerci. 



....Family PEDILIDAE 



This is a small fam- 

 ily of some 50 North 

 American species. The 

 one pictured is west- 

 ern. Members of the 

 genus Pedilus are 

 more frequent. 



107a. Venter of 9th abdominal segment with trans- 

 verse row of asperities, or small plates. 



Fig. 307. 



108 



Fig. 307. Ven- 

 tral aspect of 

 8th and 9th ab- 

 dominal s e g - 

 ments. 



107b. Venter of 9th abdominal segment not so armed. 



Fig. 308 Family PYTHIDAE 



This little family of bark beetles 

 ^^ boasts less than 25 North Ameri- 

 CL f b^UX^ ^^^ species. Adults and larvae 

 ore found under bark of pine trees 



Fig. 308. a, Rhinosimus ruficollis 



L; b. Ventral aspect of 8th and and occasionally Other species. 

 9th abdominal segments. 



108a. 8lh abdominal segment at least twice as long as 9th, cerci ex- 

 cluded; a pair of pits in margin between cerci. 

 (See Figs. 309 and 310) 109 



108b. 8th and 9th abdominal segments subequal, cerci excluded; a 

 single pit present in margin between cerci. 

 (See Figs. 311 and 312) 110 



109a. 9th abdominal venter bearing asperities arranged in a continu- 

 ous arch. Fig. 309 Family PYROCHROIDAE 



fs The larvae are found 



*^»<.nn under bark or in 



f^ j^^rn^ 'jr\fv^'r' 7>i^7^\\ \ <]\ P^v^'l wood. Adults have 



^ ^c/-.c,y areas of brilliant yel- 



L low or red and are 

 known as "fire-colored 



Fig. 309. Neopyrochroa *emoralis Lee.; hp^ptlps" 



b, Ventral aspect of 8th and 9th ob- DSeties . 

 dominal segments. 



114 



