120 NEOTROPICAL PSELAPHIDAE 



of head not modified between the eyes, usually simple, convex or flattened; 

 front of head simple between the bases of the antennae and tnmcate to gently 

 arcuate; head not dilated anteriad of the eyes, but narrowing from eye to 

 antennal insertion. 



Melba of Casey (1897), and Group II of Raffray (1904). 



crassipes Raffray. 1908. Guadeloupe, Leeward Islands. 



eggersi (Reitter). 1883. Puerto Rico; St. Thomas, Virgin Islands. 



(Trimiopsis) 

 gibbula (Reitter). 1883. St. Thomas, Virgin Islands. (Trimiopsis) 

 grenadensis Raffray. 1904. Grenada, Windward Islands. 

 inconspicua (Reitter). 1883. St. Thomas, Virgin Islands. {Trimiopsis) 

 specularis (Reitter). 1883. St. Thomas and Water Island, Virgin 



Islands; Dominica, Leeward Islands. (Trimiopsis) 

 longicollis Raffray. 1912. Argentina, (con Atta lundi Guer.) cf. 



Bruch, 1929. 



Frontelba new subgenus 



As for Melba, save that the front of the head is prolonged between the 

 antennal bases, above the epistomal area, as a flat or a multi-tuberculate, tri- 

 angular piece, more pronounced in the male sex. 



Group III of Raffray (1904). 



clypeata (Reitter). 1883. St. Thomas, Virgin Islands. (Trimiopsis) 

 fleutiauxi (Raffray). 1890. Guadeloupe, Leeward Islands. (Trimiopsis) 

 frontalis Raffray. 1908. Guadeloupe, Leeward Islands. 

 'f.mimula (Sharp). 1887. Guatemala. (Trimiopsis) 

 Iminuta (Shai-p). 1887. Guatemala. (Trimiopsis) 



Vertelba new subgenus 



Tenth antennal segment bilaterally symmetrical ; vertex of head with ver- 

 texal foveae between the eyes connected by an arcuate sulcus; vertex of head 

 with a large, deep, transverse excavation, the excavation being medianly tu- 

 berculate. Otherwise similar to Melba. 



caviceps Raffray. 1909. French Guiana. 



Quadrelba new subgenus 



Tenth antennal segment bilaterally symmetrical ; vertex of head with ver- 

 texal foveae between the eyes connected by an arcuate sulcus; head quadrate 

 or square in outline, the sides being tumid, dilated or subdentate between the 

 eye and antennal base, this dilation being more pronounced in the male sex. 



Group IV of Raffray (1904). 



