NORTH AMERICAN HYMENOPTERA. 221 



20.— Abdomen above, parti fularly the first two segments, coarsely puuctnred, ami 

 more or less banded Si- 

 Abdomen strongly, though not coarsely i)unctured above, not banded, but 



with lateral spots 23. 



21.— First joint of medial tarsi strongly curved ; space between the eyes at base 

 of clypeus not greater than the width of the latter in the middle; tro- 

 chanters and femora reddish, not black scaber^ 



First joint of medial tarsi not or scarcely curved; space between eyes at 



base of clypeus greater than the width of the latter in the middle- • -22. 



22.— Legs not at all black, rufous and yellow; mandibles not yellow, but a spot 



on episternum mesopleuralis ; abdomen more or less rufous; pronotura 



strongly dentate laterally riifipes. 



Coxae, trochanters, femora except apex and spot on tibige internally, black ; 

 mandibles spotted with yellow, but no spot on episternum mesopleuralis ; 

 abdomen not at all rufous; pronotum with the lateral tooth small. 



texaniis. 

 23.— Pronotum with a large, strong tooth on each side ; head rather finely and 



closely punctured spiiiiferus. 



Pronotum but slightly dentate ; head with large, separated punctures. 



!«tir|>i<>ola. 

 24. — First joint of flagellum not nearly as long as the two following joints united, 



not more than one-quarter longer than the second 25. 



First joint of flagellum nearly as long as the two following united, more 

 than one-quarter longer than the second (femora at apex broadly, and 



greater part of tibipe and tarsi, yellow) clirysargiiius. 



25.— Greater part of femora black ; wings not or but slightly yellowish ; dorsulum 

 compactly punctured; abdomen ventrally not spotted; first joint of 

 medial tarsi longer than the three following united. . .odyneroides. 

 Legs fulvous and yellow; wings strongly yellow on basal half; dorsulum 

 posteriorly with the punctures tolerably well separated ; abdomen more 

 or less spotted ventrally ; first joint of fore tarsi shorter than the follow- 

 ing three united imbutus. 



26.— First joint of medial tarsi strongly angular on outer margin, shorter if any- 

 thing than the following two joints united ; sculpture of dorsulum not 

 exceeding coarse ; epimerum mesopleuralis usually with a yellow spot -27. 

 First joint of medial tarsi but slightly angular on outer margin, slightly 

 longer than the two following joints united; sculpture of dorsulum 

 exceedingly coai-se ; episternum mesoplenral is not spotted -rufifeniiir. 

 27.— Segments 2-6 of abdomen with a band ; tibise spotted internally- dilectiis. 

 Segments 4 and 5 (possibly the third sometimes) with a band ; tibict not 



spotted within bigemimi!*. 



28— Anterior trochanters armed with a strong spine or tooth beneath : femora 

 fulvous in greater part ; lateral spots or lines on abdominal segments 1-4, 

 a narrowband on the sixth, the ventral segments not marked with yellow 



10-iiiaciilatiis. 



Anterior trochanters simple, not spinose : femora not fulvous, yellow in 



greater part ; all the dorsal abdominal segments with a bi-oad band, the 



ventrals entirely yellow Packardii. 



29.— Abdomen without bands, the s])ots all widely separated 30. 



Abdomen ■' with a broad yellow b:ind at the base of fifth segment, the sixth 

 entirely yellow." aciculat US. 



TRANS. AM. ENT. SOC. XXII. JUNE. 1895. 



