164 COLOMBIAN DERMAPTERA AND ORTHOPTERA 



at hand but one species of the plain forms, L. strigiveiitris (West- 

 wood), is so represented. 



We would note that Libethra aurita Rehn, which species Brun- 

 ner has ignored, describing the synonymous Libethra confusa, is 

 referable to the genus Sermyle. Kirby has selected as genotype 

 of Sermyle, Acanthoderus mexicanus Saussure, which species 

 Brunner later places in his genus Ocnophila. Were the species 

 there included congeneric, this would invalidate Ocnophila. 



Libethra spinicollis new species (Plate XXIII, figs. 1 and 2.) 



This stout and highly specialized species is nearest L. rabdota 

 (Westwood), differing strikingly in being decidedly shorter, the 

 head with numerous smaller, irregular, blunted spines caudad of 

 the pair of thickened composite spines (in this feature alone 

 agreeing rather with L. bifolia (Stal) ), the pronotum with paired 

 clusters of heavy, blunted, composite spines caudad (not occur- 

 ring in any other known species of the genus), the mesonotum 

 with a similar pair of fused clusters of smaller, blunted, composite 

 spines caudad, the first dorsal abdominal segment with four nodes 

 at the caudal margin, the second with a large depressed lobe (as 

 in rabdota), the third with medio-longitudinal carinae terminating 

 in a very small lobe, the sixth with medio-longitudinal carinae 

 developing into a small depressed lobe. 



Type. — 9 ; San Antonio, Cauca, Colombia. Elevation, 6600 

 feet. October, 1908. [United States National Museum.] 



Size medium for genus, form robust. Head with occiput armed with a pair 

 of sublamellate, thickened, composite spines, caudad of which are numerous 

 smaller, irregular, blunted spines, which decrease in length caudad, cephalad 

 and laterad of which are still smaller blunted spines and nodes. Antennae 

 simple, slender, extending to near caudal margin of metanotum. Pronotum 

 with surface rugulose and nodulose, broadly subsulcate mesad and proximad 

 on each side, with paired clusters of heavy, blunted, composite spines caudad; 

 width greater caudad, nearly equal to length. Mesonotum rugulose and nodu- 

 lose, moderately tectate, with an irregularly placed longitudinal row of short 

 stout spines (three to four) on each side, and hear the caudal margin armed with 

 a pair of fused clusters of short, stout, Vjlunted, composite spines. Mesopleura 

 armed with an irregularly placed longitudinal row of short stout spines (five 

 and six). Metanotum nodulose, with a few short, stout, blunt spines proximad; 

 minute elongate rugulose pads above the trochanters of the median limbs sug- 

 gest vestigial wings. Metaplcura armed with a longitudinal row of short, 

 stout spines (four and four). Median segment rugulose. Dorsal abdominal 

 segments nodulose, irregularly multicariiuilate; first with four small, blunt, 

 coni(!al proje(;tions at caudal liiargin, of which the median pair ar(! deflexed 

 caudad; second with a large, transverse, horizontally extended lobe caudad, 



