436 PROCEEDINGS OF THE ACADEMY OF [1899. 



ZETHOIDES gen. nov. 



Allied to Zethus which it greatly resembles superficially, and 

 seems to difier only in the following points: Middle tibiae one- 

 spurred ; labrum broadly truncate ; mandibles elongate, with four 

 large teeth reaching from apex half way to base on inner margin. 

 In the only species known, the clypeus is armed with two large 

 prongs, between which it is broadly incurved, and all the tarsi are 

 flattened and short ; but these are probably sexual characteristics. 

 Female unknown. 



In the shape of mandibles this genus would fall in Saussure's 

 " Legion II. The Odynerites,"^ while the shape of abdomen, with 

 its pedicellated second segment indicates its affinities with 

 " Legion I. The Zethites. " As it stands, Zethoides must be con- 

 sidered a connecting link between these two Legions. The 

 palpi agree with those of Zethus in the number of joints, those of 

 the labial palpi in length are as follows : the first longest, the 

 second shorter, but longer than the two following united, the last 

 smallest, quite minute. 

 Zethoides Smithii n. sp. 



Black; autennse entirely, cheeks, base of clypeus, most of pro- 

 notum, outer margin of tegulse and legs more or less, fulvous; 

 clypeus, scape beneath, mandibles, eye emargination, dots at sum- 

 mit and behind eyes, anterior margin of pronotum, spot under 

 wing, two dots on scutellum and postscutellum, stripe on four 

 anterior tibiae and medially interrupted line at apex of petiole, 

 yellow; wings subhyaline, brownish along costal margin. 



^. — Head with strong, not coarse, sparse punctures; clypeus 

 finely and closely punctured the fore margin armed with two huge 

 spines or teeth, between which the clypeus is roundly emarginate ; 

 antennae curled at tip, the ultimate joint robust, broadened and 

 truncate apically, fully as long as the two preceding ones united, 

 penultimate joint smallest, the ninth emarginate so that the apical 

 one in consequence of the rolling up of the tip of antenna fits into 

 the emargination, first joint shorter than the two following united; 

 space between hind ocelli much less than that between them and 

 eyes; parted by a furrow which extends back on the occiput; 

 pronotum cristate, dentate at sides, with shallow punctures; dor- 



^ Synopsis American Wasps, p. 59, 



