412 Mr. F. Smith on new Species 



clouded at their anterior apical margin. Abdomen : the base 

 of the second segment and the third and fifth segments yellow, 

 with a semicircular black macula at their basal margins ; the 

 fourth segment with a lateral yellow spot ; beneath yellow, 

 with the apical margins of the segments rufo-piceous. 



Male. Length 3-3| lines. Resembles the female — but is 

 not so brightly coloured, the spots on the scutellum obsolete, 

 and the yellow segments have more black at their base, and 

 it is the third and sixth segments that are coloured ; the 

 femora, tibiae, and posterior tarsi are more or less black ; the 

 abdomen beneath is only slightly marked with yellow. 



Hah. Northern India. 



This species has the aspect of a small form of the European 

 Gerceris ornata. 



Cerceris albopicta. 



Female. Length 4£ lines. Head and thorax black, with 

 white markings ; abdomen red at the base, black beyond, 

 with white fasciae. Head black, and finely and closely 

 punctured ; the mandibles, face as high as the insertion of the 

 antennas, the clypeus, and scape in front white ; sometimes a 

 white line behind the eyes. Thorax : the collar, tubercles, 

 two spots on the scutellum, the postscutellum, and legs white ; 

 the femora and tibiae with a fuscous line behind ; the antenna? 

 and first two segments of the abdomen ferruginous ; the second 

 segment more or less black at its apical margin ; the third and 

 fifth segments with white fascia? on their apical margins, the 

 fascia? widening laterally. 



Male. Length 3-3 1 lines. Only differs in having fewer of 

 the white markings, particularly those on the thorax. 



Hah. India (Bombay Presidency). 



Cerceris fluvialis. 



Female. Length 5^ lines. Reddish yellow, closelypunctured, 

 the mesothorax and fourth segment of the abdomen most 

 finely so. Head : a curved black band on the vertex between 

 the eyes, widest in the middle, and enclosing the ocelli; the 

 clypeus truncate in front, the upper margin of the truncation 

 subtuberculate in the middle; tips of the mandibles black; 

 a sharp carina between the antenna?. Thorax beneath, the 

 mesothorax above, and hinder portion of the metathorax 

 black ; the wings towards their base flavo-hyaline, the nervures 

 ferruginous ; the apex of the wings fuscous, with a darker 

 cloud in the marginal cell. The fourth segment of the abdomen 

 black. 



Hab. Swan River, Australia. 



