4 THE SCOLYTID BEETLES. 



different stages, habits, etc., of D. frontalis, and larvae and habits of 

 D. terebrans ( = D. valens). In 1901 he described D. piceaperda in 

 all stages in connection with an account of habits, seasonal history, 

 etc., and referred to the type of D. rufipennis (Kirby). In 1902 he 

 described D. ponderosse in all stages, in connection with an account of 

 habits, seasonal history, etc. In 1 902, under " Some Notes on the Genus 

 Dendroctonus," he referred to a statistical method of determining 

 natural positions of the species, and gave a list of described species 

 and manuscript names of undescribed species, as follows: D. pinicida 

 MSS., D. arizonicus MSS., D. monticola MSS., D. ponder osse Hopk. 

 MSS., D. Jceeni MSS., D.fletcheri MSS., D. piceaperda Hopk., D. dietzi 

 MSS., D. californicus MSS., D. shoshone MSS., D. wickJiami MSS., 

 and D. borealis MSS. He restored D. brevicomis Lee. and D. punctatus 

 Lee. from Dietz's synonymy, and recognized D. obesus (Mann). In 

 1905 he described D. pseudotsugse and D. monticola in connection 

 with accounts of habits, seasonal history, etc. 



ORIGINAL DESCRIPTION OF GENUS. 



Dr. W. F. Erichson (1836) described the genus Dendroctonus as 



follows : 



DENDROCTONUS. 



[p. 52] Antennae funiculo 5-articulato, capitulo 4-annulato, suborbiculari, com- 

 presso. Tibiae extus denticulatae. 



Palpi maxillares articulo primo brevissimo, secundo maximo, sequentibus duobus 

 sensim minoribus. Labium fortiter compressum. Palpi labiales articulo primo 

 longiore, subclavato, secundo tenuiore, cylindrico, minuto, tertio obtuse subulate. 

 Antennae breves, scapo clavato, funiculi articulo primo breviter clavato, secundo 

 obconico, reliquis brevibus transversis; capituli segmentum primum reliquis con- 

 junctis aequale, politum. [p. 53] Corpus oblongum, cylindricum. Rostrum brevis- 

 simum. Prosternum antice obsolete impressum. Coxae anticae approximatae. Tibiae 

 compressae, extus denticulatae. Tarsi articulo tertio dilato, bilobo. Elytra margine 

 antico elevato. 



[Translation.] 



Antennae with 5-jointed funicle; the club suborbiculate, com- 

 pressed, with four segments (annulae). Tibiae externally denticulate. 



Maxillary palpi with the first joint very short, the second the 

 longest, the two following gradually smaller. Labium strongly com- 

 pressed. The labial palpi with the first joint rather long, subclavate, 

 the second joint more slender, cylindrical, small, the third obtusely 

 subulate. Antennas short, scape clavate, first joint of funicle shortly 

 clavate, second joint obconical, the remaining joints short, trans-' 

 verse; first segment of club equal to the others conjointly, polished. 



Body oblong, cylindrical. Beak very short. Prosternum ante- 

 riorly obsoletely impressed. Anterior coxae approximate. Tibiae 

 compressed, externally denticulate. Tarsi with the third joint 

 dilated and bilobed. Elytra with the anterior margin elevated. 



