AMERICAN HYMENOPTERA. 251 



152. Head larger, broader thau thorax, strongly produced behind the eves. .153. 

 Head moderate, not strongly produced behind the eyes 155. 



153. Wings smoky-hyaline, tinged brownish, nervures and stigma brown. Man- 



dibles toothed within. Thin hair bands on segments 5 and 6. 



|>I;it,v|»;iri;i form occideutalis Ckll. 

 Wings hyaline, nervures and stigma honey-yellow. Mandibles long, slen- 

 der, the extreme base toothed below 154. 



154. Joint 3 of antennas about equal to 5 mil ml iluilsi ii> Rob. 



Joint 3 of antenna? about equal to 4 + 5 triilcn* Rob. 



155. Wings hyaline, iridescent, the nervures and stigma testaceous. Abdomen 



covered above with hairs -156. 



Wings not iridescent, either hyaline or smoky 157. 



156. Inclosure at base of motathorax not margined and scarcely rugulose. Ab- 



dominal fasciae almost obsolete niflesta Sm. 



Inclosure at base of metathorax bounded by an impressed line, rather dull 

 and minutely roughened. Hind margins of segments with thin white 

 hair bands. Antennas wholly black, moniliform. 



monilicornis Ckll. 



157. Nervures and stigma pale yellow. Apex of abdominal segments somewhat 



depressed, testaceous, and more or less covered with pale hair bands. 



macilenta Prov. 

 Nervures and stigma brown or ferruginous 158. 



158. Pubescence on head and thorax long, white or pale yellow. Fascia 3 of long 



white hairs on abdominal segments. Stigma ferruginous. 



<lisl;uis Prov. 

 Pubescence on head and thorax white, more or less mixed with black on 

 vertex and about antennae. Stigma very dark brown. 



segregans ckll. 



159. Larger, usually 12 or more mm. in length .160. 



Medium, between 10 and 12 mm. in length 172. 



Smaller, between 8 and 10 mm. in length lit:;. 



160. Stigma of anterior wing abnormally small. Pubescence throughout abund- 



ant and of moderately uniform length .161. 



Stigma of anterior wing normal. Pubescence variable 165. 



161. Anal fimbria sooty. Abdominal fascia? white, that on 1 interrupted, on 2-4 



continuous Karberi Ckll. 



Anal fimbria yellowish or fulvous. Abdominal fascia' more or less ochra- 

 ceous 162. 



162. Wings milky white, the nervures and stigma dark ferruginous. Abdomen 



with thin fasciae on segments 2-4 OiraMiicheri Ckll. 



Wings more or less hyaline 163. 



163. Apical margins of abdominal segments testaceous 164. 



Apical margins of abdominal segments concolorous. Wings smoky, their 



apical margins clouded, nervine'- dark ferruginous. Fimbria reddish 

 ochraceous iiitidor Ckll. 



164. Wings clear hyaline, the nervures and teguke pale testaceous. Fimbria pale 



fulvous liclianlhi Ckll. 



Wings fulvo-hyaline, apical margins clouded, nervures testaceous. Fimbria 

 golden-yellow rmlheckia* Rob. 



TRANS. AM. EST. SOC. XXIX. AUGUST. 1903 



