FIELD BOOK OF INSECTS. 



Callidiini. (See page 339.) 



1. Elytra bluish-black, with narrow, raised, longitudinal, 

 white lines on the middle; pronotum with very deep, 

 median groove; femora distinctly club-shaped; general 

 color, black; .5 to .7 in. long. Larvae bore in elm 



Physocnemum brevilineum. 

 Elytra without distinct, raised, white lines 2. 



2. Pronotum very short, strongly rounded on the sides, 

 red; upper surface not shining; black; about .75 in. long. 



Rhopalopus sanguinicollis. 



Pronotum not very short, the width not much exceed- 

 ing the length; upper surface more or less shining 3. 



3. Front coxae at least moderately separated. Merium 

 (pronotum with a broad, smooth, shining median space 

 on the basal half) and Hylotrupes (pronotum with a narrow 

 median elevation and moderate or small ones on the sides). 

 H. ligneus is usually not over .5 in. long; elytra yellow 

 except for apical third and a circular spot on each, which 

 portions are, together with the head and pronotum, 

 bluish-black. Breeds in cedar. H. bajalus is about .75 

 in. long; brown to black, with grayish-white pubescence 

 that may form two irregular bands on the elytra. Breeds 

 in pine and spruce. 



Front coxae touching Phymatodes and Callidium. 



Phymatodes varius is black to (especially thorax and 

 basal part of elytra) reddish-brown; two slightly curved 

 crossbars on elytra; about .3 in. long. The larvae mine 

 the inner bark of diseased oaks. P. variabilis (about .5 in. 

 long; elytra blue, or yellow, or blue with yellow margins. 

 Larvae in oak bark.) and P. amcenus (about .25 in. long; 

 elytra bluish. Larvae in dead grape stems.) have the 

 pronotum reddish-yellow. P. dimidiatus has an almost 

 black pronotum; elytra reddish-brown, lighter at the 

 base. The larvae are "bark-slippers" of cord-wood. 

 Callidium antennatum (over .5 in. long; surface rough) 

 and janthinum (about .5 in. long; surface shining) are 

 dark blue. They breed in conifers. C. izreum is less than 

 .5 in. long and brownish-yellow. Its larvae mine the inner 

 bark of chestnut. 



342 



