NO. 1432. NE W SPECIES OF EAR WIGS—REHN. 511 



Exposed portion of the wing's slightly more than half the length of 

 the tegmina, the lateral margins rather tapering, the tips narrowly 

 truncate. Abdomen strongly constricted cephalad and narrowed cau- 

 dad at the anal segment; lateral plica? present on the proximal seg- 

 ments; depressed lateral unguicular processes present on three 

 segments, adpressed and recurved, the two segments cephalad of the 

 anal unarmed; anal segment transverse, the caudal margin very 

 slightl}' arcuate, slightl}^ depressed, median longitudinal sulcus very 

 faint; subgenital plate transverse, caudal margin rotundato-emarginate, 

 the angles projecting; pygidium cuneiform, the apex slightly expanded, 

 truncate. Forceps of the type usual in the genus, bent arcuate, the 

 apex spiniform, the thickened pre-apical portion moderate in size and 

 armed proximad with a spine similar to the apical but smaller and 

 blunter. Limbs slender; tarsi with the second joint strongly depressed, 

 cordiform, no arolia present. 



General color dull brownish black; head orange-rufous, eyes black, 

 antenna chestnut becoming blackish distad; pronotum with the lateral 

 portions ferruginous; forceps ferruginous; limbs inclined toward 

 cinnamon. 



Measurements. 



mm. 



Length of body (excluding forceps ) 1 L 



Length of pronotum 1.7 



Length of tegnien 3. 6 



Greatest abdominal width 4. 6 



Width of anal segment 2.5 



Length of forceps 5. 



The type is unique. 



Genus OPISTHOCOSMIA Dohrn. 

 OPISTHOCOSMIA BOGOTENSIS, new species. 



Type. — Male; Bogota, Colombia. (Coll. Henry G. Klages.) [Cat. 

 No.^8166, U.y.N.M.] 



Apparently allied to 0. hrahma Burr from northern India, but dif- 

 fering in the greater size, the different coloration, and the peculiar 

 sculpture of the dorsal surface of the last abdominal segment. Like 

 that species it appears to be quite distinct from any of the other forms 

 of the genus. 



Size large; form strongly depressed; surface smooth, dull, on the 

 abdomen and forceps supplied with numerous points as detailed in 

 the following. Head subtrigonal, slightly elongate, slightly inflated; 

 caudal margin truncate; eyes rather large and prominent; antennae 

 rather thick, strongly compressed proximad. Pronotum very slightly 

 transverse, the cephalic and lateral margins straight, the cephalo- 

 lateral angles very slightly rounded; caudal margin arcuate, caudo- 

 lateral angles obtusely rounded; transverse median depressed area 

 Proc. N. M. vol. xxix— 05 34 



