PROC. ENT. SOC. WASH., VOL. 22, XO. J, OCT., 1920 169 



The four named species of the genus fall into two groups : one 

 with the beetles green and the impressed area on the dorsal plate 

 of the prothorax of the larva broad, and the other with the beetles 

 bronze and the impressed area on the dorsal plate of the larva 

 narrow. The new species has the beetle bronze but otherwise 

 more like the green species. Its general appearance is similar 

 and the larva has the impressed area of the dorsal plate broad. 

 Is it a sport of one of the present named species or is it a local 

 surviving species of the genus which at one time may have con- 

 tained a number of flourishing species? 



Taking the evidence as a whole, the writer is inclined to be- 

 lieve that Trachykele is a vanishing genus. Many beetles of all 

 of the species through some weakness fail to emerge from the 

 wood. Sometimes fragments of many dead specimens are found 

 in an old scar on one tree. This condition may explain the 

 rarity of specimens in most collections. At least, it indicates to 

 the writer that the species now existing are not very well fitted 

 to present conditions and probably are slowly vanishing. 



The new species appears more closely related to blondeli Mars, 

 than to any of the other species. It may be a sport of that 

 species. Blondeli occurs in the same host within a hundred miles 

 and at its closest point appears to vary considerably. Some 

 specimens are entirely green while others have golden or coppery 

 margins. In other localities all specimens are green. 



Trachykele hartmani, n. sp. 



Adult Holotype, Female. Large, stout, length 22 mm., width 8 mm., coarse 

 elongate oval, widest about distal third of elytra; brownish bronze, elytra 

 with a violet tinge and golden reflections, marked by black velvety depressed 

 areas some of which tend to form three fasciae on each elytron and some 

 smaller ones which tend to form rows along the suture; entire body beneath 

 clothed with coarse whitish recumbent hairs and marked by large pits to 

 and including the first abdominal sternum and by smaller pits beyond. Head 

 marked by a short frontal ridge and clothed ventrally by the whitish hairs, 

 eyes elongate oval and brownish; antennae reaching nearly to the caudal 

 margin of the thorax, joints 1-4 rather round and long, 1st longest, joints 

 5-11 more flattened and triangular. Prothorax, length 5 mm., width 7 mm., 

 slightly wider at base than at apex, sides strongly angulate, caused by well 

 developed lateral crests; disk with three anterior impressions and two large 

 posterior ones, median anterior impression raised, terminating posteriorly in 

 a smooth ridge which ends in a small pit close to the posterior margin, sur- 

 face marked by large pits and some white hairs. Elytra slightly wider and 

 three times as long as the prothorax, humeri rather prominent; sides slightly 

 diverging for two-thirds of length, thence gradually narrowed; apex sub- 

 truncate; disk rough, with numerous longitudinal and transverse ridges, sur- 



