SOME BEES OF THE GENUS CROCISA. 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. alhopicta, 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. basalts, Friese. 



First segment showing at least a large patch of lilack 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 C. 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. luzonensis, Ckll. 

 Abdominal bands pale . . . . . . 9. 



9. First abdominal segment with about middle third and 



hind margin dark C. irisana, Ckll. 



First abdominal segment broadly dark . . .10. 

 10. Pleura with lower half black-haired . C. amboinensis, Eads. 



Pleura with the lower part pale-haired . C. viassurii, Eads. 



Crocisa albopicta, sp. nov. 

 2 . Length about 12 mm., expanse 24J ; 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- 



