CTENISTINI 293 



3. Head with a very long, recurved infraocular spine amazonica 



Head without an infraocular spine, but with a small pencil of setae 



below each eye nasuta 



4. Not known south of Guatemala dispar 



Not known north of Colombia 5 



5. Head with a very long, recurved infraocular spine aequinoctialis 



Head with a very thin, nearly straight infraocular spine . . . angustata 



Key to the Females 



Not known south of Guatemala dispar 



Not known north of Colombia 2 



2. Apparently indistinguishable on the described characters: 



aequinoctialis 

 amazonica 



Only three of the above six species have known females, and this key 

 does not include fasciculata and gracilis. The species may be listed as follows: 



aequinoctialis (Aube). 1844. Matto Grosso, Brazil and Valencia, 



Colombia. (Also recorded from Amazon basin) 

 amazonica Raffray. 1896. Amazon basin, Brazil. 

 angustata Raffray. 1896. Argentina. 



dispar (Sharp). 1887. Cordova, Mexico and Paraiso (300 feet), 

 Guatemala, {brevicollis Raffray, 1896) 

 Genotype. (Desimia) . 



I have a female of what I consider dispar from Sabinas Hidalgo, 



Nuevo Leon, Mexico, collected June 14, 1941, by Charles Seevers. 



This locality is in northern Mexico, is not rain forest, and extends 



the range of Sharp's species materially. 



fasciculata Raffray. 1908. Buenos Aires, Argentina, con Solenopsis 



richteri Forel, cf. Bruch, 1929. 

 gracilis Raffray. 1908. Argentina. 

 nasuta Raffray. 1896. Amazon basin, Brazil. 

 raffrayi Casey. 1893. Tucson, Arizona, and Mexico, {dispar Raffray, 



1896, nee Sharp.) 



PILOPIUS (Casey, 1897) 

 Casey (1897) 

 Bowman (1934) 



This genus is typical of the nearctic fauna. Out of sixteen species, thirteen 

 are found within the United States, including the genotype Pilopius lacustris 

 Casey; one species is reported from Japan (Pilopius discedens (Sharp), 1883; 

 cf. Raffray, 1904, 1908) ; one species, Pilopius zimmermani (LeConte) has a 

 remarkable range for a pselaphid if the species population is truly homogen- 

 eous; and one species is reported from the neotropics. 



