AMERICAN HYMENOPTERA. 173 



4. Segment 6 finely and closely punctured ; black ; pale pubescence white; hair 



of ventral segment 6 black generosa. 



Segment 6 more densely and coarsely punctured ; less black ; pale pubescence 

 griseous; hair of ventral segment 6 usually whitish brevis. 



5. Middle and hind metatarsi as wide as their tibia; ; ventral segment 6 reflexed 



behind dorsal segment ; margin of clypeus shining, with a median 

 dentiform carina; joint 1 of labial palpi one-sixth shorter than 2. 



sexdentata. 

 Middle and hind metatarsi narrower than tbeir tibia? ; joint 1 of labial palpi 

 one-fourth shorter than 2; rather small and slender. 



Cyphopyga montivaga. 

 Males. 



Spines on apical margin of segment fa' long, quite distinct; carina strongly pro- 

 duced, narrow, with deep rounded notch and strong incurved teeth ; 

 7 usually produced, truncate or emarginate; mandibles 4-dentate, 

 middle tooth notched; pubescence of vertex aud mesonotum rarely 

 mixed with black sexdentata. 



Spines on apical margin of segment 6 short, more or less concealed 1. 



1. Pubescence pale yellowish or griseous, rarely mixed with black ; segment 6 



with carina jagged, middle usually notched, apical margin with a lat- 

 eral tooth and an inner dentiform carina nearer the lateral tooth than 



its fellow of the opposite side ; mandibles 3-dentate brevis. 



Pubescence mi*ed with black above 2. 



2. Carina of segment 6 straight or concave laterally, widely notched, forming two 



great, usually jagged teeth; 7 produced into a long spine; mandibles 



4-dentate ; front tarsi strongly ciliate addenda. 



Carina of segment 6 convex laterally 3. 



3. Lateral ocellus nearer the edge of vertex than to nearest eye; carina strongly 



produced and notched, its margin nearly entire; apical margin of seg- 

 ment 6 with two lateral teeth and two median carina?; 7 truncate; 



mandibles 4-dentate, median tooth notched petulans. 



Lateral ocellus not nearer the edge of vertex than to nearest eye; carina 

 ordinary, its margin jagged ; margin of segment 6 with four teeth ; 7 

 pointed ; mandibles 3-dentate ; front tarsi strongly ciliate 4. 



4. Pubescence white; median tooth of segment 6 nearer the lateral one than to 



its fellow of the opposite side ; larger generosa. 



Pubescence more ochraceous; median tooth of segment 6 nearer its fellow 

 than to the lateral one ; smaller mendica. 



COELIOXYINI. 

 COEL.IOXYS Latrielle. 



Females. 



Clypeus bilobed ; segment 6 rather abruptly narrowed ... sayi. 



Clypeus regularly convex 1- 



1. Segment 1 with basal and apical fascia?; edge of concavity carinate; 6 with a 

 terminal reflexed spine ; ventral segment 6 broadly rounded, mucro- 



nate, black ciliate modesta 



Segment 1 with apical fascia?, edge of concavity hardly carinate 2. 



TRANS. AM. ENT. SOC, XXIX. APRIL, 1903. 



