TYCHINI 263 



3. Total length more than two millimeters infossus 



Total length less than two millimeters 4 



4. Antennal segments III-VIII regularly moniliform; head as long as 



wide pullus 



Antennal segments III-VIII not all moniliform; head shorter, not as 

 long as wide labialis 



The species of Dalmodes may be listed as follows: 



gracilipes Raffray. 1904. Blumenau, Brazil. 



infossus Raffray. 1911. Sierra de Baturite, Brazil. 



labialis (Schaufuss). 1887. Rio de Janeiro, Matto Grosso, Brazil. 



[Batrisohryaxis) . Genotype. 

 pullus Raffray. 1911. Matto Grosso, Brazil. 

 rybaxoides Reitter. 1882. Mexico. {Dalmodes as emended?) 



BYTHINOPHYSIS (Raffray, 1908) 



This genus was erected on a single species from French Guiana {puncti- 

 pennis). Originally the genus was separated from Dalmodes by having the 

 first tergite longer than the second, elytral margins slightly dilated, and distal 

 palpomere sharply securiform, whereas Dalmodes has the first tergite sub- 

 equal to second, elytral margins not dilated and distal palpomere only slightly 

 securiform. These two genera agree in such basic features as widely separated 

 posterior coxae and flank of each elytron with a longitudinal sulcus, so that 

 they are quite close together. Bythinophysis has no basal elytral foveae and 

 consequently I have placed several species, formerly in Dalmodes, in this 

 genus as the qualitative character of no basal elytral foveae seems more funda- 

 mental than a quantitative length of the first tergite, amount of flair of elytra 

 and degree of securiformity of the last maxillary palpal segment. In this I 

 may be in error but more morphological research is indicated before the ques- 

 tion may be laid aside arbitrarily. It is possible that the two genera will have 

 to be combined under Dalmodes. In the present state of our knowledge the fol- 

 lowing key may help to separate the species with the exception of plicatulus. 



First tergite distinctly longer than second tergite; antennal segments 

 III obconical, IV-VI quadrate, VII-VIII slightly transverse, IX-X 

 crescentric and transverse; 1.5 mm.; known from female only. . . . 

 punctipennis 



First and second tergites subequal 2 



2. Pronotum with the transverse sulcus entire and connecting the lateral 



foveae each side 3 



Pronotum with the transverse sulcus abbreviated so that the median 

 fovea is transversely dilated; known from male only: sternites 

 longitudinally excavated; fourth sternite strongly toothed on each 

 side; intermediate trochanters compressed and toothed at base of 

 ventral face; posterior tibiae bisinuate, with a small tooth at mid- 

 dle of internal face ; 1.65 mm ensipes 



