Occasional Papers of the Museum of Zoology 13 



basal one is larger, and two on dorsomesal edge proximad of 

 middle. Other joints unarmed (Plate IV, Fig. 16). 



Length, 16 mm. 



British Guiana, Dunoon: Labba Creek, "first mourie," sand- 

 hill forest, August 18 and 26, 1914, F. M. Gaige. Two specimens. 

 "The first collected in rotten wood and the second under fallen 

 leaves in a tree clump." T^-pe, M.C.Z., 2179. 



Otostigmidae 



Otostigmus scabricaudus (Humbert and Saussure) 



Branchiosloma scabricaiida, Rev. et Mag. Zool., Ser. 2, XXII (1870), 203 



Colombia: San Lorenzo. One female taken from a bromeliad 

 on a tree, July 22, 1913. 



Otostigmus clavifer, sp. nov. 

 Plate I, Fig. 3 



Dorsum in general light olivaceous; sometimes the caudal 

 borders of tergites, the first tergite, and head caudad of the frontal 

 region with prosternum somewhat Ught ferruginous, or the first 

 tergite and head abruptly darker brown. Legs pale olive, the 

 antennae browner. 



Head with punctae sparse; with no paired sulci. 



Antennae rather long; composed of twenty articles of which 

 the first two and the basal fourth or less of the third are essentially 

 glabrous. 



Prosternal teeth 4+4, the innermost and outermost on each 

 side smaller than the median two, the interval between which is 

 wider than the others. Sulcus at base of dental plates forming an 

 obtuse angle at middle, from which a short median line extends 

 caudad. 



Dorsal plates distinctly bisulcate from the fifth caudad. 

 Excepting the last none of the tergites laterally margined. None 

 of the plates with a median keel, all smooth and shining, with no 



