398 Mr. T. D. A. Cockerell — Descriptions and 



cheeks; antennae black, middle joints of flagelluni much 

 longer than broad; mandibles reddish subapically ; labrum 

 shining, without pits; thorax (except scutellum) \\\i\\ hair 

 partl}^ greyish white and partly black, about evenly mixed on 

 mesothorax, greyish black on pleura ; mesothorax shiuing, 

 with weak punctures; area of metathorax with a basal series 

 of very small pits, the apical triangle transversely (rather 

 obliquely) plicatulate laterally. Wings dusky hyaline ; 

 tegulse, nervures, and stigma piceous ; stigma small. Legs 

 normal, the hair light and dark as on thorax ; hair on hind 

 femora long and pale ; hind spur ordinary. Abdomen short, 

 shining, bandless, with minute feeble punctures, hair of apical 

 part mainly black, of basal pale, ochreous-tinted. 



Closely related to C. patagonica, Schrottky, but that species 

 is larger and has the hair all black or fuscous^ except that on 

 scutellum, which is orange-red. C. hicolur, !Sm., has the hair 

 of thorax above entirely very bright apricot-colour, but the 

 abdomen is blue. 



Hah. Patagonia, V. del Lago Blanco ( Chuhut). Type in 

 British Museum. 



Tetrapedia swainsonce, sp. n. 



A testaceous species, very close to T.flava {Exomalopsis 

 flava, Smith), and at first sight identical, but the clypeus has 

 only a few very minute punctures, while that of Jlava has 

 very strong punctures; the flagellum is darker than in Jlava. 

 In the male the sides of the face are yellow, but the front 

 below the ocelli is dark brown, with a sutfustd median 

 yellowish stripe. The stigm.a and nervures in male are dark 

 reddish brown, in female amber-colour. The wings in both 

 sexes are yellowish. There is a superficial resemblance to 

 Trigona 23a,llida, Latr., from Brazil. 



Hah. Jamaica; in British Museum. ? . Bath, St. Thomas, 

 1892 {E. M. Swainson); ? . Jamaica, 97-166 ; c? • -P. Cr. 

 River, St, Thomas, June 1892. 



The following table separates the testaceous species of 

 Tetrapedia and Exomalopsis described by Smith : — 



Second r. n. precisely meetiDg third t.-c, the 

 outer sides of the adjacent cells continuous 

 and without any appendieulation at the 

 juncture; outer side of hind basitarsus 

 covered with dark soot-coloured hair. (S. [Sm. 



Paulo.) Tetrapedia Icevifruns, 



Second r. n. joining third a.m. before the end .. 1. 



1. Mesothorax shining, evidently punctured. . 2. 



Mesothorax dull not evidently punctured . . S. 



