120 BULLETIN 417, U. S. DEPARTMENT OF AGRICULTURE. 



CALOSOMA WILKESII Lee. 



ORIGINAL DESCRIPTION. 



Deep black, punctate, with thorax mere than twice shorter than broad, narrowed 

 posteriorly, sides quite rounded, margin somewhat retlexed, base broadly emarginate, 

 posterior angles slightly produced, elytra nearly one-half longer than broad, not 

 dilated posteriorly, rugose-punctate, with pits on both sides faintly marked in triple 

 row. Length 0.65. Oregon. I have seen a specimen also in collection of the cele- 

 brated Exploring Expedition led by Charles Wilkes. 



This species was described by LeConte * in 1851 and has since 

 been reported as occurring in California, Idaho, Oregon, and Wash- 

 ington. 



CALOSOMA LUXATUM Say. 



ORIGINAL DESCRIPTION. 



Brownish-black; elytra reticulate; head and thorax minutely punctured. 



Inhabits Arkansas. 



Mandibles flattened above, rugose, with oblique lines: head punctured: antennae, 

 second joint half as long as the third; thorax minutely punctured, punctures larger 

 and confluent on the lateral margin; posterior angles rounded, extending backwards 

 a little beyond the basal line; an impressed longitudinal line: elytra suborbicular, 

 reticulate; longitudinal lines not more dilate or profoundly impressed than the trans- 

 verse ones, which are not continuous, the points of intersection not distinguished by 

 a puncture; the three punctured strise obsolete, their traces hardly discernible in a 

 certain light and not differently colored. 



Length more than three-.fifths of an inch. 



This insect has the short, transverse thorax of Calosoma, but the proportions which 

 the joints of the antennae bear to each other are similar to those of many Carabi; the 

 transverse lines are dislocated by the longitudinal ones. 



Described by Thomas Say in 1823. Since that time several other 

 species have been described which are generally considered as varie- 

 ties of luxatum. Among these are striatulum Lee, zimmermani Lee, 

 and pimelioides Walk. The former is undoubtedly a synonym of 

 luxatum Say and the latter of zimmermani Lee. The writers have 

 seen specimens of Calosoma striatulum Chev. from Arizona, which was 

 described in 1835 by A. Chevrolat, habitat, Perote, Mexico. 2 



A few writers believe that some of those above-mentioned are dis- 

 tinct species 3 but the writers are unwilling to separate them in this 

 way without having a large amount of material for comparison and 

 study, and this is not available at present. 



The bibliography is all listed under C. luxatum with a summary of 

 the notes given on it and its varieties by various authors. It is the 

 belief of the writers that a careful revision of this species and its 

 so-called varieties should be made. 



The writers feel, however, that a more complete series of specimens 

 should be available for study before this is done, hence the whole is 

 considered under luxatum and its varieties. 



1 LeConte, J. L. Description of new species of Coleoptera from California. In Ann. Lye. Nat. Hist. 

 N. Y. f. 1851, v. 5, p. 125-216 (p. 200). 



2 The writers have received the loan of some material in this group from various entomologists of the 

 United States, also have been in correspondence with Dr. E. C Van Dyke, of the University of Cali- 

 fornia, who has a large collection and who intends publishing later. The writers appreciate the need of 

 detailed work in this group and give way to one who possesses the material for properly treating it. 



3 Col. Thos. L. Casey, in his " Memoirs on the Coleoptera IV " (Lancaster, Pennsjdvahia, 1913, p. 66-7.5), 

 holds this view. He has subdivided the genus into Calosoma and Callisthenes, listing under the latter 

 luxatum Say, zimmermani Lee, striatulum Lee, pimelioides Walk., latipenne Horn, and several new spe- 

 cies and subspecies. 



