148 NEOTROPICAL PSELAPHIDAE 



obnubila Raffray. 1904. Mexico. 



stussineri (Reitter). 1882. Brazil. (Bryaxis) 



subfoveolata (Schaufuss). 1872. Colombia. (Bryaxis). It should be 

 pointed out that this same species is also placed in Group XXI by 

 Raffray (1904). I have followed this since I am unfamiliar with 

 subfoveolata. 



Group LV 



This group is probably composite. It includes a species from Madagascar, 

 a species from Sumatra, and two neotropical species. One of these latter prob- 

 ably should be placed in a new group, since the vertex is sharply carinate 

 medianly in the male, and obtusely carinate in the female sex. This heterogene- 

 ous assemblage agrees in having the two vertexal foveae normally placed 

 between the eyes, but the median frontal fovea is wholly absent, in both males 

 and females. Males have the fifth antennal segment large, of relatively ab- 

 normal size. The two neotropical species may be separated as follows: 



Vertex of the head normally convex nominata 



(2.0 mm. long; known from the female only) 

 Vertex of the head with a median, longitudinal carina or an obtuse 



carinoid elevation 2 



2. Vertex with a strong, sharp, median longitudinal carina which anteri- 

 orly becomes an obtuse ridge; basal part of vertex and adjacent 

 occiput with a transverse, densely but finely granulated area cov- 

 ered with long, yellow, anteriorly directed setae; antennal segment 

 V very large, about three times longer than second segment, arcuate 

 externally, armed internally near apex with a strong, apically en- 

 larged spicule; 1.4 mm. long; metasternum medianly depressed.. . 



carinifer Male (PI. XVII, 17) 



Vertex with an obtuse carina between the vertexal foveae; antennal 

 segment V elongate-cylindrical, as long as third and fourth seg- 

 ments united, not spiculate on internal-apical face 



carinifer Female (metasternum not depressed) 



carinifer Fletcher. 1928. Mexico. 



nominata (Sharp). 1887. Guatemala. (Bryaxis) 



Group LVI 



So far as known this group is purely American, and at present holds two 

 neotropical species. They are allied to the fifty-fifth group in having no trace 

 of a frontal fovea, and one of the species at least, has the epistomal area 

 prominently elevated. It is also possible that the taxonomy of this section of 

 the genus is very involved, and some changes may have to be made when 

 more information has accumulated. 



This group is separated from the fifty-fifth group in that the males have 

 the fifth and sixth antennal segments abnormal, while the previous group had 



