238 HYMENOPTEEA. 



and thicker than them. The propleurae striolate, the top indistinctly punctured ; the 

 mesopleurae strongly punctured, sparsely covered (as is also the breast) with long white 

 hair. The abdomen covered with shallow punctures ; the sides of the second, third, 

 and fourth segments, and the fifth entirely, fringed with pale fulvous hair; the 

 pygidium densely covered with long fulvous hair at the base, the apex reddish, finely 

 punctured ; the ventral surface punctured, the segments fringed with pale fulvous hair ; 

 the hypopygium fringed at the sides with short thick hairs. 



The coxes and femora sparsely, the tibiae and tarsi densely, covered with long silvery 

 hair, the tibiae with golden hair on the outside ; the hind coxae punctured ; the calcaria, 

 tarsal spines, and claws reddish ; on the hinder femora in the centre is a short tooth. 

 The first recurrent nervure is received before the middle, the second in the apical 

 third ; the third cubital cellule at the top is longer, at the bottom shorter, than the 

 first and second cellules united. 



This species may be easily known from the others here described by the sinuated 

 channel on the median segment, and by the toothed hinder femora. 



7. Epomidiopteron rufitarse. 



Nigrum, clypeo albo ; flagello antennarum, tibiis anticis, tarsisque runs ; alis fusco-hyalinis, stigmate fusco. 3 . 

 Long. 7 millim. 



Hab. Mexico, Temax in North Yucatan (Gaumer). 



Head closely covered with more or less confluent punctures, sparsely clothed with 

 longish fuscous hair ; the clypeus finely punctured, thickly covered with white hair ; 

 mandibles ferruginous, black at the base and apex. Pronotum closely punctured, 

 except at the extreme apex, which is margined with white ; the base at the top keeled ; 

 the mesonotum and scutellum with the punctures larger than on the pronotum ; the 

 median segment with a keel down the middle, and a transverse keel across the middle, 

 the latter dividing the segment into two parts, the apical part strongly striolated, the basal 

 part aciculated, and with four longitudinal keels. The pro- and metapleurae striolated, 

 the former punctured at the top; the mesopleurae strongly punctured. Abdomen 

 punctured, at the base strongly, the punctuation becoming weaker towards the apex ; 

 the sides of the dorsal and the whole of the ventral segments fringed with fulvous hair ; 

 the pygidium punctured, reddish at the apex, the centre keeled ; the hypopygium not 

 keeled. The tibiae and tarsi densely, the femora sparsely, covered with silvery hair; 

 the calcaria pale reddish. The third cubital Cellule at the top longer, at the bottom 

 distinctly shorter, than the first and second cellules united ; the second recurrent 

 nervure received in the middle of the cellule. 



I cannot with any certainty unite the male from which the above description is taken 

 to any female Epomidiopteron known to me. Sichel describes a variety of the male of 



