THE GENUS CALOSOMA. 97 



clothed with short hairs dorsally while the remainder of the segments 

 are smooth. General appearance same as other species of the genus. 



Several of the larvae reared in 1914 lived to pupate and adults 

 were secured. Pupation took place in a cavity in the earth which 

 was usually formed at the bottom of a glass jar where observations 

 could be made on the transformations. The specimens studied 

 pupated in July and August. Eleven to fourteen days were passed 

 in this stage. 



July 11, one pupa was noted in cavity, light yellow in color with 

 dark brown eyes. July 25, 10 a. m., the beetle was fully formed, 

 body, wings, and femora still white; eyes, tibise, and tarsi black; 

 1.30 p. m., the immature beetle all black except central portion of 

 body; 6.30 p. m., beetle all black and fully formed but occupying 

 pupal cavity. 



July 26, a female emerged from the cavity. Other young beetles 

 emerged in breeding experiments at this time instead of remaining 

 in the same cavity for hibernation. Some of the species reared at 

 Melrose Highlands, Mass., namely, calidum, have this habit to some 

 extent. 



CALOSOMA TRISTOIDES Fall. 



ORIGINAL DESCRIPTION. 



This name is proposed for a form occurring in our extreme southwestern region, 

 which is closely related to but quite surely distinct from triste of the west central 

 states. As compared with Kansas specimens of triste, in my collection tristoides 

 differs in the much finer punctures of the elytral series, these becoming very minute 

 posteriorly, and in the usually well developed greenish lustre of the elytral margins. 

 The sides and basal impressions of the prothorax also show more or less of the metallic 

 lustre in many specimens, but in some it is barely perceptible. The coarser serial 

 punctures of intervals 4, 8, 12 are green as in triste, but in the latter species the side 

 margins of the body are scarcely at all so. In the type series of three examples of 

 triste in the LeConte collection the sides of the prothorax are evenly rounded and the 

 elytra are parallel in both sexes. In tristoides the prothorax exhibits considerable 

 inconstancy in both relative and actual dimensions, the width varying from 1.53 to 

 1.72 times the length, the sides either evenly rounded or evidently straighter pos- 

 teriorly; the basal sinuations are also variable in depth. The elytra are quite uni- 

 formly parallel in the male and a little wider posteriorly in the female. It is, however, 

 very probable that a good series of triste, or for that matter of any other species of 

 Calosoma, would show similar variability. In length tristoides ranges from 22 to 24 

 mm., width 9.4-10.2 mm. The length'given for triste in LeConte's table is 18 mm. 



Tristoides is based on a good series taken by Mr. Ricksecker at or near San Diego, Cal. 



A single specimen from an unknown source and simply labeled "Cal." has stood 

 for years in my collection as triste. There is a single example from "Cal." in the 

 LeConte collection placed near but not in line with his specimens of triste and bearing 

 a"?" label. 



This species was described by Mr. H. C. Fall in 1910 x from specimens 

 taken at or near San Diego, Gal., by Mr. Ricksecker. The writers 

 have examined two female specimens collected by Mr. W. M. Mann, 

 at Pachuca, Hidalgo, Mexico. Mr. H. W. Wenzel, of Philadelphia, 

 has kindly furnished a cotype of this species for examination and 

 study. 



iFall, H. C Miscellaneous notes and descriptions of North American Coleoptera. In Trans. Amer. 

 Ent. Soc, v. 36, p. 89-197 (p. 92), 1910. 



54880°— Bull. 417— 17 7 



