38 U. S. P. R. R. EXP. AND SURVEYS ZOOLOGY 47TH PARALLEL. 



appearance, resembles C. canaliculatus, but the mentum is of a different form, and on compari 

 son many other differences may be seen. From C. Schaumii, Lee. (Proc. Acad. Nat. Sc. 6, 231) 

 it differs by the smaller size, less rounded sides, but more acute angles of the thorax, and by 

 the posterior angles being separated by a small but deep oblique impression ; near the margin 

 of the elytra may be seen a few whitish tran verse undulated lines. 



TRYSSUS Er. 



T? comatus, nitidus, capite obscuro, confluenter punctato, clypeo concavo rotundato, fortiter 

 marginato, thorace luteo-ferrugineo, marginibus longissime flavo-pilosis, lateribus valde rotun- 

 datis, angulis anticis acutis, confertim punctato, versus latera utrinque foveato, elytris piceo- 

 testaceis, ad marginem flavo-pilosis, obsolete punctatis, stria suturali profunde exarata, propy- 

 gidio dense punctato, pubescente, pygidio parce piloso et punctulato, nitido : subtus ferrugi- 

 neus, femoribus et pectore longe pilosis, abdomine glabro, articulo sexto postice parce fimbriato. 

 Long. -68. 



One specimen, Sacramento, Mr. Wittick. This is the first appearance of the group Macro- 

 phyllidae in America ; it differs from the genuine Melolonthidae by the segments of the abdo 

 men being separate, with distinct sutures. On account of the 9-jointed antennae with three 

 jointed club, I have referred it to a genus constructed by Erichson (Ins. Deutchl.) for some 

 South African species ; the ungues are cleft, (as required by his description,) each division being 

 broad and acute, the inferior one is a little short ; the tarsi are longer than the tibiae, and the 

 last joint is armed with a small tooth beneath, near the tip. The labrum is large and emargi- 

 nate, and the epimera of the metathorax are broad. 



DIPLOTAXIS Kirby. 



D. brevicollis, ferrugineo-picea, oblonga nitida, capite confertim punctato, sutura frontali 

 distincta, clypeo late emarginafco, margine anguste reflexo, thorace latitudine triple breviore, 

 punctato, antrorsum angustato, antice transversim impresso, ad angulos posticos foveatim exca- 

 vato elytris serie suturali, quatuor per paria approximatis, quinqueque externis punctatis, 

 interstitiis inter paria et suturam disperse punctatis ; pygidio grosse punctato. Long. 45. 



Steilacoom, Washington Territory ; George Gibbs, esq. One specimen. 



D. subangulata, oblonga, nigra nitida, clypeo confertim punctato marginato, lateribus obli- 

 quis ad apicem late truncate, thorace sub-hexagono, sat punctato, latitudine plus sesqui brevi 

 ore antice angustiore, lateribus medio obtuse angulatis et rotundatis, angulis posticis obtusis 

 vix rotundatis, elytris oblongis thorace latioribus, punctis minus subtilibus seriatim digestis 

 (seriebus internis confusis); pygidio confluenter grosse punctato. Long. *34. 



Oregon. Similar in appearance to many others, but readily known by the characters given. 



DICHELONYCHA Kirby. 



D. valida, elongata, nigro picea, supra parce subtus densius albopubescens, thorace brevi 

 hexagono, inaequaliter grosse punctato vage impresso, modice canaliculate, elytris confertim 

 rugose punctatis, fusco ameis viridi tinctis, margine, antennis pedibusque testaceis. Long. 55. 



One specimen ; San Francisco, Mr. Child. Larger than any other species known to me. 

 The New Mexican D. sukata, Lee., (report of Captain Pope s expedition,) has the thorax 



