AMERICAN COLEOPTERA. 137 



There are five species recognized by Chaudoir, one of them pro- 

 visional. In order that the student may be in possession of the data 

 on which Chaudoir bases his recognition of these species the following 

 facts are presented. 



T. nigricollis Lee, one specimen presented by Dr. LeConte. 



T. Pilatei Chd., one specimen said to be from Texas. 



T. ruficollis Lee, no type from the author; two other specimens 

 which seem to differ a little from the description and cause Chaudoir 

 to suggest provisionally the name 



T. glabrlpennis Chd. 



T. croceicollis Men., not seen at all by Chaudoir. 



From the above it will be seen that from four specimens two of which 

 belong to one species, enough has been learned to admit the validity of 

 four species and to suggest the possibility of a fifth. 



My own cabinet, with that of Dr. LeConte, contains eighteen speci- 

 mens. I have examined about half as many more from other cabinets 

 and have become convinced that there is but one species variable princi- 

 pally in color. The study in detail is as follows : 



Var. Pilatei Chd. — Head and thorax above and beneath red, also 

 the meso- and metasternum, legs and antennas. Elytra bright blue or 

 greenish-blue, abdomen piceous. This form has the thorax a little less . 

 arcuate on the sides. 



Var. ruficollis Lee. — Head and thorax above and beneath red. 

 Antennas brownish. Meso- and metasternum at middle reddish at 

 sides piceous, abdomen piceous. Legs piceous, brownish-red at base 

 of femora. 



Var. croceicollis Men. — Colored as in ruficollis except that the head 

 becomes brown deepening in color to piceous. The metasternum entirely 

 piceous. Legs piceous. 



Var. Colored as in croceicollis with the thorax becoming 



gradually browner. 



Var. nigricollis Lee. — In this variety the elytra are of a deep violet- 

 blue, the change from the brilliant blue observed in Pilatei having 

 progressed gradually from that variety to the present. Here the head 

 and thorax above and beneath and the under side of the body, legs 

 and antennas are piceous becoming shining black. 



Var. glabrlpennis Chaud. — This name was suggested for two speci- 

 mens of ruficollis from which the fine pubescence of the elytra had 

 been removed. 



TRANS. AMER. EST. SOO. X. (35) AUGUST, 1882. 



