SOME BEES OF THE GENUS CKOCISA. 217 



The material on which this paper is based is all in the British 

 Museum ; it may be tabulated as follows : — 



First three abdominal segments each with four widely 

 separated white spots ; first segment also with a 

 basal spot ...... C alboincta, Ckll. 



Abdomen not thus ornamented, but more or less 



banded ......... 1. 



1. Markings strongly metallic ; wings very dark . . 2. 

 Markings not or hardly metallic . . . . 3. 



2. Abdominal markings violet ; first segment with a broad 



continuous, or almost continuous, basal band 



C. quartincB, Gribodo, var. a. 

 Abdominal markings blue ; first segment with only 



lateral marks ...... C verticalis, Ckll. 



3. First abdominal segment practically covered with blue 



hair ....... C basalis, Friese. 



First segment showing at least a large patch of black 4. 



4. Scutellum with a pair of blue spots ; abdomen with 



narrow bands ....... 5. 



Scutellum not or not clearly spotted ; abdominal bands 



broad, or widely interrupted ..... 6. 



5. Apical and basal bands of first abdominal segment 



united laterally ..... C rostrata, Friese. 

 Apical and basal bands not united laterally G. japonica, Friese. 



6. Basal band of abdomen complete or with a linear in- 



terruption . . . . . . . . 7. 



Basal band of abdomen widely interrupted, or if not 



so, the median part hidden by scutellum . . 8. 



7. Anterior margin of pleura entirely covered with light 



hair ........ C. ridleyi, Ckll. 



Anterior margin of pleura dark in middle . C. decora, Smith. 



8. Abdominal bands bright azure blue, wings very dark 



(Philippine Islands) . . . . C. luzoncnsis, Ckll. 

 Abdominal bands pale ...... 9. 



9. First abdominal segment with about middle third and 



hind margin dark ..... G. irisana, Ckll. 



First abdominal segment broadly dark . . .10. 

 10. Pleura with lower half black-haired . G. amboinensis, Kads. 



Pleura with the lower part pale-haired . G. massurii, Eads. 



Crocisa albopicta, sp. uov. 

 ? . Length about 12 mm., expanse 24| ; intense black, with white 

 spots ; scutellum W-shaped, but the median angle much greater than 

 a right angle ; wings dark fuscous, with the usual hyaline spots ; 

 mesothorax 9-spotted, the anterior lateral spots mainly on prothorax, 

 the median anterior line short, four discal spots forming the corners 

 of a quadrangle, and a small spot above each tegula anteriorly 

 scutellum unspotted, the hair projecting from under its hind margin 

 black, except a little white in the middle ; pleura with a broad zigzag 

 transverse white band, and two spots below ; sides of metathorax with 

 a patch of white hair ; tegulse black, with a patch of white hair pos- 



