TYCHINI 269 



as habitus, posterior coxal separation, antennal separation, sternite number and 

 longitudinally divided seventh male stemite, in pronotal structure and other 

 characters. Both genera disagree on such fundamentals as abdominal margina- 

 tion and elytral structure, so a new genus had to be erected in keeping with the 

 separation of genera in Tychini. 



As species, brunneus and petrunkevitchii are widely different on many char- 

 acters, in addition to generic differences, such as the very abnonnal and special- 

 ized male antennae of brunneus, radically different character of the male vertex 

 and male stemite modification. 



I have also included Dalmodes brevicoUis Sharp in this genus. My series 

 consists of five specimens as follows: three males from log mold on July 20, 

 1936, collected by Dr. Charles Seevers in Cordoba, Vera Cruz; one female on 

 June 18, 1941, by Mr. Dybas from Huichihuyan, San Louis Potosi; one male on 

 July 10, 1941, by Dr. Seevers from Penuela, Vera Cruz. These specimens were 

 mounted on points or cleared and slide-mounts prepared. On careful study they 

 appear to agree with Sharp's description and figure of brevicoUis from Guate- 

 mala, in so far as these go. However, the males have seven sternites with the 

 seventh sternite longitudinally divided; the females have six sternites and this 

 is not Dalmodes where both sexes have six simple sternites. In the next place 

 the males have the last tergite strongly produced into a sharp, conical spine 

 whereas the female has a rudimentary spine. Sharp stated that the abdominal 

 spine was strong in the female and rudimentary in the male, although his ob- 

 servation that the male hind tibiae are spined while the females have unarmed 

 tibiae agrees with my series. Finally the elytral flanks are ornamented with a 

 long, strong carina which Sharp might have interpreted as a sulcus. 



The penis of the males of my material is very large (0.45 mm. long x 0.27 

 mm. wide) through the basal bulb, extending nearly to the second sternite, and 

 of typical tychine pattern, so that the sex is not in question. 



In the following key both sexes are included and Buris added since these 

 three species, although very different, have the same habitus: 



Seven sternites present, the seventh longitudinally divided into two 



pieces Males 2 



Six sternites present Females 4 



2. Elytral flank with a longitudinal carina ending near humeral angle in 



a fovea Buris brunneus 



Elytral flank with a longitudinal carina ending near humeral angle but 

 lacking a subhumeral fovea 3 



3. Posterior tibiae with a large, triangular, acute spine on internal face 



at basal third Dalnioburis brevicoUis 



Posterior tibiae without tooth at basal third and with a minute spur 

 at apex Dalmoburis petrunkevitchii 



4. Elytral flank with a longitudinal carina and subhumeral fovea 



Buris brunneus 



Elytral flank with a longitudinal carina but without a subhumeral 

 fovea 5 



