4 PROCEEDINGS OF THE NATIONAL MUSEUM. vor.. (il 



joint as long as the second and third together; joints 2-7 transverse; 

 club very poorly defined, with the terminal joint nearly as long as 

 the three preceding joints together. Eyes large and convex, situated 

 in front of middle of sides of head. Pronotum broader than long, 

 sides strongly convex, dorsum nearly fiat. Promesonotal and 

 mesoepinotal sutures strongly impressed. Mesonotum about one- 

 fifth as long as pronotum, with moderately convex surface. Basal 

 and declivous portions of epinotum equal in length, rounding into 

 each other ; the surface of the base broadly convex, of the declivity, 

 flat. Petiole thick wedge-shape, higher than long, rounded above, 

 anterior surface moderately convex, posterior surface flat. Gaster 

 large and thick, longer than the thorax ; sting short and thick. Legs 

 not incrassate. 



Shining, with fine punctures, each bearing a long and rather coarse 

 hair, rather sparsely distributed on head and body and mandibles. 

 Appendages with fine, short, recumbent hairs. 



Color black; mandibles and antennae reddish brown, with the tips 

 of the antennae lighter; anterior femora, except the bases and tips, 

 apical halves of middle and posterior femora, the tips of the tibiae 

 and all of the tarsi reddish brown, remainder of legs honey yellow. 



Tyj)e locality. — Honduras : San Juan Pueblo. 



Cotypes.—C^t. No. 24433, U.S.X.M. 



Described from two workers that were taken with one larva and a 

 pupa in a depression in a half rotten log near a stream in the forest. 

 Though I searched intensively in this and in similar localities for 

 more specimens I did not find the species again. 



Th. ferox is the second species of this striking genus. Th. muti- 

 latus described by Mayr from workers from Santa Catherina, Brazil, 

 and since rediscovered in the same locality by Von Ihering has the 

 head much longer in proportion to its breadth, the cheeks do not pro- 

 ject, the mandibles are shorter with the spines less developed and the 

 antennal joints are shorter. The structure of the thorax and ab- 

 domen in the two species is very similar. 



HOLCOPONERA STRIGATA Norton. 



Honduras : Lombardia. 



OPISTHOSCYPHUS, new genus. 



Worker. — Allied to Alfarla Emery. 



Head subquadrate. Mandibles elongate, composed of a thickened 



near portion, on the inner side of which is a lamellate plate that 



gives the whole an elongate trigonal appearance. Clypeus short and 



broad, anterior portion horizontal, posterior portion broad, extending 



as an irregular impression between the frontal carinae but not 



