HYMENOPTERA. 311 



7. MELISSODES DENTICULATA. B.M. 



Male. Length 4 lines. Black, the clypeus yellow, and having 

 its base narrowly black ; the mandibles yellow at their tips ; the 

 flagellum fulvous beneath, except the two basal joints ; the head 

 and thorax have a thin hoary pubescence, as well as the legs, the 

 apical joints of the tarsi ferruginous; the wings hyaline, their 

 nervures fuscous. Abdomen ovate, and having a thin hoary pu- 

 bescence at the base and sides; on the second, third, fourth 

 and fifth segments are indistinct bands of the same coloured 

 pubescence, usually more or less interrupted on the second and 

 third ; at the lateral margins of the fifth segment, at its base, a 

 short angular acute tooth and a smaller one at the base of the 

 sixth segment ; the lateral margins of all the segments slightly 

 testaceous. 



Hab. United States. 



8. MELISSODES SENILIS. 



Female. Length 4 lines. Black, the pubescence of the 

 head and thorax cinereous; the legs nigro-piceous, the apical 

 joints of the tarsi ferruginous; the anterior and intermediate 

 tarsi have fuscous pubescence, on the posterior tibiae and tarsi it 

 is pale fulvous, on the basal joint of the posterior tarsi within it 

 is fuscous; the wings subhyaline, the nervures ferruginous. 

 Abdomen very smooth and shining, at the base a little cinereous 

 pubescence, the second segment has on its basal margin laterally, 

 a line of white pubescence attenuated within ; a similar line in 

 the middle; the third and fourth segments have a band on their 

 basal margin, attenuated in the middle ; the fifth and sixth are 

 clothed with fuscous pubescence ; beneath, the apical margins 

 are ciliated in the middle with fuscous pubescence, and on the 

 sides with white. 



Hab. North America (Mount Pleasant, Ohio). 



This is very probably the female of M. denticulata ; both are 

 from the same locality and have a close specific resemblance. 



9. MELISSODES NIGRIPES. B.M. 



Female. Length 7 lines. Black, the head and thorax covered 

 with ochraceous pubescence, that on the latter palest ; the legs 

 and their pubescence black; wings subhyaline, their nervures 

 ferruginous; the tegube pale testaceous; the abdomen and its 

 pubescence entirely black ; sometimes a little ochraceous pubes- 

 cence at the base and the apical margins rufo-testaceous. 



Male. Length 5 lines. Very closely resembling the female ; 

 the clypeus yellow ; the flagellum pale fulvous or yellow beneath, 



