some British Guiana Hymenoptera. 301 



Genus Exomalopsis, Spinola. 

 E. glohosa, F. Botanic GJardens, Georgetown. 



Genus Epichakis, Klug. 

 E. nistica, Oliv. Rockstone, Essequebo River. 



Genus Melitoma, Latr. 



M. euglossoides, Lep. From cultivated Cotton blossoms, 

 Georgetown. This bee has a curious babit of clinging to 

 the edges of blades of Para grass, with its mandibles firmly 

 embedded in the tissues. The reason for this is not 

 apparent. They remain quite motionless in this position, 

 and at times may be seen in considerable numbers. Fairly 

 common about coast lands. 

 • 



Genus Centris, F. 



C. longimana, Lep. A common species both on the 

 coast lands and in the interior. It is attracted to strong- 

 smelling substances such as salt fish, and will follow boats 

 with this substance on board for long distances up the 

 rivers. Frequently seen about buoys moored in the centre 

 of the tidal passages in the big rivers and elsewhere. It 

 is apparently attracted there by the excreta dropped by 

 sea-birds on these objects. It has a swift, noisy flight. 



C. lanipes, F. Fairly common on the coast lands and in 

 the interior. Has been taken at flowers and also in the 

 act of collecting soft mud from a pathway. 



C. versicolor, F. Taken on one occasion while attracted 

 to artificial light. Appears to occur only in the interior. 



C. jjersonata, Sm. It has similar habits to C. longimana, 

 liCp. Taken under similar conditions in the North-west 

 District. 



C. labrosa, Friese. An uncommon species. H.M. Penal 

 Settlement, Mazarmii River. 



Genus Thygater, Holmb. 

 T. rubricata, Sm. Rockstone, Essequebo River. 



Genus Euglossa, Latr. 



E. diniidiata, F. A fairh^ conmion species in most 

 parts of the Colony. Observed on several occasions to 

 collect mud from a pathway. A somewhat clumsy insect, 



TRANS. ENT. SOC. LOND. 1918. — PARTS II, III, IV. (mAY '18) X 



