66 U.S. NATIONAL MUSEUM BULLETIN 266 



Body segments 39 or more with pronounced longitudinal crests and 

 conspicuous repugn atorial pores L YSIOPETALIDEA 



Suborder CHORDEUMIDEA 

 KEY TO THE FAMILIES OF CHORDEUMIDEA 



1. Segments with a prominent lateral shoulder; gonopods united by a 



large, apically divided, anterior sternite DYBASIIDAE 



Segments not prominently shouldered; gonopods not united by 

 a large sternite 2 



2. Gnathochilarium with mentum divided, having a distinct promentum; 



9th male legs with 4 or 5 joints beyond sternum. CLEIDOGON ID AE 



Gnathochilarium with mentum entire; 9th male legs 3-jointed beyond 



sternum TRICHOP ETALID AE 



Family CLEIDOGONIDAE 



Genus ACAKANDRA Loomis 1964a, p. 99. 



TYPE SPECIES: Acakandra austrina Loomis, by original designation. 

 Acakandra austrina Loomis 1964a, p. 99. 



TYPE: Chicago Nat. Hist. Mus. 



TYPE LOCALITY: Cerro Punta, Chiriqu' Prov., Panama. ^ 



PARATYPE LOCALITIES: Same and near Nueva California, Chiriqui 

 Prov., Panama, 



Genus CAVOTA Chamberlin 1942b, p. 8. 



TYPE SPECIES: Cavota crucis Chamberlin, by original designation. 

 Cavota crucis Chamberlin 1942b, p. 8. 



TYPE: Escuela Nat. Mexico City. 



TYPE AND PARATYPE LOCALITY: Gruta de Atoyac, Veracruz, 

 Mexico. 



Genus CLEIDOGONA Cook 1895, p. 3. 



Cryptotrichus Packard 1883, p. 189. 



Campodes BoUman 1893, p. 120 (not C. L. Koch). 



Cleidogona Cook and Collins 1895, p. 41. 



TYPE SPECIES: Spirostrephon caesioannulatus Wood, by monotypy. 



For nearly 70 years the genus Cleidogona has been attributed to Cook 

 and Collins 1895, p. 41, overlooking the fact that on an earlier page 

 Cook alone proposed the name to replace Cryptotrichus Packard, pre- 

 occupied in Coleoptera, for specimens from Culmana, Alabama, and 

 Ocean Springs, Mississippi, which Packard identified as Cryptotrichus 

 (Spirostrephon) caesioannulatus (Wood). Although Packard undoubtedly 



