BRACHYGLUTINI 181 



DRASINUS (Raffray, 1904) 



Raffray (1904) {Drasinm, p. 148 and Euteleia in part, p. 183) 



Raffray (1908) (Drasinus) 



Fletcher (1928) (Drasinus) 



This genus is restricted to the neotropics. It contains at present four species 

 which may be characterized as follows: (1) ventral surface of the head with 

 a strong median, longitudinal carina; (2) antennae with ten segments; (3) 

 maxillary palpi with four segments, of which the last has the external face 

 convex, the internal face slightly concave to straight, and the apex bluntly 

 rounded; (4) mesothoracic coxae slightly but distinctly separated, the meso- 

 stemum extending between them as a truncate plate; (5) metathoracic coxae 

 distant from each other; (6) abdomen with the first tergite having a narrow 

 but strongly formed margin; (7) first stemite hidden beneath the coxae and 

 metasternum so that the first visible stemite is morphologically the second. 



Raffray (1904, p. 148) in erecting Drasinus states that the intermediate 

 (mesothoracic) coxae are slightly distant; in his generic key (1908, p. 196) 

 Raffray places Drasinus in a group having contiguous intermediate coxae, and 

 later in the same paper (1908, p. 226) in discussing the genus notes that the 

 intermediate coxae are slightly distant. The 1908 generic key of Raffray is 

 incorrect and the generic diagnosis of 1904 and 1908 must be followed. 



I have placed Drasinus and Decarthron much nearer together than the 

 relative positions given them by Raffray, despite the difference in the ventral 

 surface of the head. This opinion was reached after a study of my own ma- 

 terial in both genera and it was a source of satisfaction to discover that Fletcher 

 (1928, p. 211) independently had reached the same conclusion. 



Key to the Species 



Bluntly rounded apex of fourth segment of maxillary palpus meeting 

 the slightly concave internal face of the segment in an acute angle, 



the segment being widest near apex (apical fifth) 



Subgenus Drasinus 2 



Bluntly rounded apex of fourth segment of maxillary palpus meeting 

 the straight to slightly convex face of the segment in a perfectly 

 rounded, non-angulate contour, the segment being widest nearer 

 the middle (apical four-sevenths of total length) and externally 

 rounded in apical fourth; this segment with a distinct terminal 

 palpal cone Subgenus Paradrasinus, new subgenus 3 



2. Known only from Mexico; 1.3-1.4 mm. long; antennal segments III 



to VII decreasing in length with the seventh quadrate .... binodulus 



Known only from Brazil; 1.2 mm. long; antennal segments IV to IX 



quadrate lewisi 



3. Known only from Mexico; 1.5 mm. long; male with the third visible 



stemite (morphological fourth) medianly tumid, the small tumulus 

 very transverse and simple, provided with a sparse fringe of setae 



