NO. 2264. BEES IN THE NATIONAL MUSEUM. S—COCKERELL. 209 



AGAPOSTEMON RADIATUS PORTORICENSIS, new subspecies. 



Male. — Length about 9 mm. Abdomen a little more distinctly 

 metallic, but base of first segment ferruginous instead of green and 

 the yellow band interrupted by ferruginous; underside of abdomen 

 yellowish-red, without distinct markings; middle and hind tibiae 

 suffusedly ferruginous on outer side; dark parts of first and second 

 abdominal segments considerably smoother than in radiatus. 



Mayaguez, Porto Rico, January, 1899, two males (Aug. Busck). 



Type^—C'At. No. 21683, U. S. N. M. 



Genus TRIGONA Jurine. 



The following table separates the African species represented in the 

 United States National Museum. Nearly all the species were received 

 from Doctor Friese and determined by him. The specimens are 

 workers, unless the contrary is stated. 



la. Scutellum entirel}^ pale or yellow, except a small black mark 

 at base; lateral margins of mesothorax pale; species not minute. 



2<2. Abdomen of worker dark, with suffused light marks at sides; 

 greater part of clypeus black. (Male abdomen testaceous, with a 

 dark triangle or second segment.) 



TRIGONA BECCARII Gribodo. 



I possess a cotype of this species, from Keren, Abyssinia, collected 

 by Beccari. 



2i. Like T. heccarii (worker), except that there is more light color 

 on scape, and the clypeus is yellow, with a narrow black band along 

 anterior margin, and a pair of oblique reddish marks above. 



TRIGONA BECCARII JOMBENENSIS Cockerell. 



Jombene Range, East Africa (Chanler-Hohnel Expedition). 



2(?. Abdominal segments rufotestaceous, with broad dark margins. 



TRIGONA BECCARII NIGRIFACIES Friese. 



15. Scutellum black, with a broad yellow margin; species not 

 minute. 



Ic. Scutellum all dark. 



?>a. Abdomen greatly elongated, narrow, so that the insect loolcs 

 like some wasp ; polished black, wings fuliginous. 



TRIGONA STAUDINGERI Gribodo. 



Zb. Abdomen otherwise. 



4:a. Very small species. 



5(2. Mesothorax polished ; wings brownish. 



62055— 20— Proc.N.M.vol.55 15 



