AMERICAN HYMENOPTERA. 367 



2. Scopa fulvous; abdomen with white pubescent fascise on segments 2-4, more 



or less fuscous on 5; subapical on 2-3; sometimes tbefascise are wholly 



or partly black; lp. 20:9; 12-14 mm. belfragei. 



Scopa rather dense, black ; abdomen black ; lp. 18-7 : • • • -rosie. 



3. Scopa fulvous; lp. 26:9; 14-16 mm. dubitata. 



Scopa blackish or fuscous; 16 mm. fuscipes. 



Males. 

 Hind spur hooked; segments 2-5 with whitish pubescent fascia?; 6 with lateral 

 spines; ventral segment 6 with two flat spines; joint 3 two or three 

 times as long as 2 ; malar space small ; clypeus yellow ; 13-16 mm. 



speciosa.* 



Hind spur simple ; segment 6 without lateral spines 1. 



1. Anterior inferior malar space large ; vein IV3 about one-half before apex of 



cell Ills ; abdomen black ; clypeus yellow ; larger 3. 



Anterior inferior malar space small ; vein IV3 about one-fourth before apex 

 of cell III ,; 11-14 mm 2. 



2. Clypeus white; mandibles rarely with basal dot; abdomen with whitish fas- 



cia belfragei. 



Clypeus yellow; mandibles usually with a basal dot; abdomen black, some- 

 times obscurely whitish fasciate rosse. 



3. Joint 3 one-half as long as 4 ; 15 mm. illinoeusis. 



Joint 3 less than one-third as long as 4 ; 13-16 mm. dubitata. 



MELISSODES Latreille. 

 Females. 



Scutel and disc of mesonotum without evident black or fuscous hairs 11. 



Scutel and disc of mesonotum with evident black or fuscous hairs ... 1. 



1. Wings hyaliue, or nearly, sometimes purplish ; cells III and III4 usually sub- 



equal ; smaller species 6. 



Wings more or less clouded or infuscated ; cell III usually shorter than III4 ; 

 larger species 2. 



2. Segment 4 with an apical white pubescent patch on each side; scopa ante- 



riorly whitish ; elsewhere the pubesceuee is black ; wings blackish ; 



lp. 16:8; 12-16 mm. bimaculata. 



Segment 4 with a continuous apical pale pubescent fascia; scopa, except on 

 metatarsus posteriorly, pale ochraceous; mesonotum with a subcjuad- 

 rate black patch ; wings yellowish 3. 



3. Abdomen with broad fascise of closely appressed white pubescence extending 



to margins on segments 2-4 ; 5-6 fuscous ; pubescence pale ochraceous ; 

 vertex without black hairs; tegulse testaceous; hind metatarsi ful- 

 vous posteriorly ; middle of mandibles rufous; cells III and Ills sub- 

 equal ; lp. 12:6: 13-15 mm. illinoeusis. 



Abdomen without broad apical fascite on segments 2-3 4. 



* In Trans. 22 : 126, 1895, & speciosa is written as a synonym of S. f rater, but 

 in January, 1903, on examining a cotype of S. frater, I found the hind spur was 

 not hooked as in S. speciosa. 



TKANS. AM. ENT. SOC. XXXI. OCTOBER, 1905. 



