BRACHYGLUTINI 143 



Group XLI 



In this group the females have the fifth and sixth antennal segments simple 

 and normal, while the males have these segments very irregular or abnormally 

 formed, being diversely expanded, foveate or spinose. 



Key to the Males 



Antennal segment V not excavated or foveate, but with one of its faces 

 produced, either as an oblique rounded process, or an acute spine, 

 or a blunted spine 6 



Antennal segment V with the ventral, mesial, or ventro-mesial face 

 foveate or irregularly excavated ; spines may or may not be present 2 



2. Antennal segment V obliquely subpyriform with the apical-mesial 



angle produced into a rounded process ; segment VI transverse, with 

 the mesial face produced into a more slender, more acute, spinoid 

 process; ventral faces of both fifth and sixth segments excavated; 

 VII much smaller than sixth, wider than eighth, subquadrate but 

 with the mesial face produced into a short, blunt process; basal 

 discal carinae of first tergite separated by one-third of the discal 

 width; metasternum slightly, obsoletely impressed at middle; last 



sternite simple, hardly impressed; legs simple; 1.8 mm. long 



mexicana (PI. XVII, 16) 



Antennal segments V, VI, VII not so formed 3 



3. Antennal segment V subcircular, excavated on the ventral face in the 



apical-internal half, and with two minute spines; VI subquadrate, 

 obconical; basal discal carinae of first tergite separated b}^ more 



than one-third of the segmental width; 1.8 mm. long biclavata 



Antennal segments V and VI not so formed 4 



4. Antennal segment V elongate, about twice as long as wide, with the 

 ventral face polished and foveate; VI also large, but about half as long 



as fifth, the length and width subequal ; VII transverse, much smaller 

 than sixth, with the internal-apical angle acute; metasternum medi- 

 anly concave with the lateral boundaries prominent and tuberculate; 



2 mm. long sallaei 



Antennal segment large, but differently formed, not elongate as de- 

 scribed 5 



5. Antennal segment V in the form of an irregular triangle, and with the 



ventral face excavated; VI transverse; 2.0 to 2.33 mm. long 



diversicornis 



(In this species the discal stria of each elytron is said to be wholly 

 absent!) 

 Antennal segment V very large, transversely quadrate, with the ventral 

 face bearing a transverse, irregularly biarcuate excavation; VI 

 transverse, with the ventral face obliquely flat and this flattened, 

 opaque surface studded with small asperities in sharp contrast to 



