356 NEOTROPICAL PSELAPHIDAE 



subequal basal tarsomeres and the third (distal) tarsomere is very long, 

 arcuate, cylindrical and bears a short, sharp tarsal claw. The legs are perfectly 

 simple and unarmed. 



Allotype Female. Similar to holotype save that: (1) the body is longer 

 and broader (2.31 x 0.94 mm.) ; (2) abdomen from a dorsal view with a taper- 

 ing apex; (3) sternite ratio entirely different, the six sternites having a length 

 ratio of 1/6/5/1. 5/.5/1. 3. This is a notable differential when the two sexes 

 are present. The male not only has a shorter, more blunt abdomen which is 

 ventrally concave, but the subequal second and third sternites are only half 

 as long as these sternites of the female. The female has the larger, more taper- 

 ing abdomen ventrally convex. 



Described on 60 specimens (56 males and 4 females). All were collected 

 from the nests of a cremastogastrine ant which is now being identified. Further, 

 this abundant material was taken in a single afternoon (June 30, 1941) at 

 5500 feet elevation near Las Vigas, Vera Cruz, Mexico, by C. H. Seevers 

 and Henry Dybas. 



Fustiger veracruzensis is a very distinct species. In the first place, it is 

 the first clavigerid from Mexico and serves to bridge the zoogeographic gap 

 between the United States species, and the Costa Rican species which have 

 been so well studied by Reichensperger. 



In the second place, veracruzensis is isolated from all other species by the 

 following combination of characters: 



1. Eyes with 30 ocular facets. This separates all United States species, 

 which never have more than 10 facets, and also clavipilis with 15 facets. 



2. Head very brachycephalic, being only about one-tenth longer than 

 wide. This separates the majority of the genus Fustiger which typically has 

 the head much longer than wide. For example schmidti, clavipilis, haytiana, 

 have head twice as long as wide and schwarzi has head three times as long 

 as wide, etc. 



3. Elytra uniformly punctate. This separates smithi with base of elytra 

 rugosely punctate. 



4. Males with unarmed legs. This separates many species. For example 

 oglobini, gounellei, insignis, haytiana, henrici, etc. have the male sex with 

 conspicuously spined or modified intermediate legs. 



5. Head and pronotum coarsely sculptured. This separates elegans which 

 has no integumental sculpture. 



Fustiger veracruzensis is most closely related to cornicen Reichensperger, 

 from the forest floor of Costa Rica. It differs from cornicen in many ways: 

 cornicen is much smaller, being 1.5 mm. long; the pronotum is as long as wide; 

 the antennae are little longer than the head, but more arcuate, much broader 

 distally, the last antennomere, in a photograph of the type, being half as wide 

 as the head. 



One thing of zoogeographic interest is that the host of this new species is 

 definitely a cremastogastrine ant, and although the southern species of Fustiger 



