BEES IN BRITISH MUSEUM. 315 



1. Head and thorax red, sides of nietathorax with patches of bright white hair 



(Para) unicolor (Sni.) 9 • 



Head and thorax black, sides of metathorax with duller patches (Brazil). 



foicolor Perty 9 • 



2. Abdomen narrower, with four white spots (Mexico). 



quadriplagiatu* (Km.). 

 Abdomen broader, without white spots 3. 



3. Second submarginal cell as broad above as below; third s. m. broader below 



than second aHer (Sm.) % . 



Second s. m. narrower above than below; third s. m. much narrower below 

 than second Eurytis funereiis Sm. 



The general appearance of the last two is the same. R. bicolor 

 is credited to Perty in the Museum, but it is believed to be identical 

 with the earlier bicolor of Lepeletier. R. quadriplagiatus is a very 

 peculiar large bee, closely imitating Scolia guttata Burm., with 

 patches of white hair on face, prothorax, pleura, sides of meta- 

 thorax, and especially four large ones on abdomen. The abdominal 

 spots of pubescence imitate the tegumentary spots of Scolia. The 

 first r. n. meets the second t. c. ; the second s. m. is very broad, but 

 somewhat narrowed above; the second and third are about equally 

 broad below. IniJ. bicolor the second s. m. is extremely broad, and 

 not narrower above; the third is not broader below than second. 

 In R. quadriplagiatus the apical segment of the male abdomen is 

 bidentate, and has a median raised line ; in R. ater it has a narrow 

 truncate plate. 



The maxillary palpi in the type of Eurytis funereus are 3-jointed, 

 the second joint very long, the others very short. These palpi are 

 to all appearances quite absent in R. ater, unicolor, bicolor and 

 quadriplagiatus, as stated by Smith and others. 



OSIRIS Smith. 

 Curious slender yellow bees, like Ichneumonids or slender Mutil- 

 lids; stigma large, wings hairy, venation quite Audrenoid, but 

 tongue entirely of the long type. 



Abdomen with distinct, clean-cut dark bands; size smaller; legs yellow (Mex- 

 ico) marginatiiK Cresson. 



Abdomen without any distinct dark bands 1. 



1. Legs yellowish testaceous; third s. m. on marginal nervure about as long as 



distance from its base below to second r. n. pallidum Sm. (T.). 



Legs ferruginous ; third s. m. on marginal nervure much shorter than dis- 

 tance from its base below to second r. n. tarsal us Sm. (T.). 



In the Museum is an apparently undescribed species which runs 

 to pal lidus in the above table, but is considerably larger. 



TRANS. AM. ENT. SOC. XXXI. AUGUST. 1905. 



