4 THE SCOLYTID BEETLES. 



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

 D. terebrans (=D. valens). In 190,1 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 histoiy, etc. In 1902, 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., B. arizonicus MSS., D. monticola MSS., D. ponderosse Hopk. 

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

 MSS., D. californicus MSS., D. sJiosJione MSS., D. wickhami MSS., 

 and D. horealis MSS. He restored D. hrevicomis Lee. and D. punctatus 

 Lee. from Dietz's synonymy, and recognized Z>. olesus (Mann). In 

 1905 he described D. pseudotsugx 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 

 eensim minoribus. Labium fortiter compressum. Palpi labial es articulo primo 

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

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

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

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

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

 compressse, extus denticulatae. Tarsi articulo tertio dilate, bilobo. Elytra margine 

 antico elevate. 



[Translation.] 



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

 pressed, with four segments (annuls). 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. Ajitennse 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. 



