Insects. 2169 



Sp. 18. Halictus prasinus, Smith. 



Female. — (Length 4j lines). Black; the face thinly clothed with 

 pale yellow pubescence ; the clypeus produced, shining, and having a 

 few large punctures ; the mandibles ferruginous at their apex. Thorax 

 nigro-aeneous, finely and very closely punctured ; the metathorax ro- 

 tundate posteriorly ; the tegulae nigro-piceous ; the wings subhyaline ; 

 nervures rufo-piceous ; the pubescence on the legs is very pale ful- 

 vous, that on the tarsi beneath is fulvous ; the claws ferruginous. 

 Abdomen ovate, shining, finely and closely punctured ; a very pale 

 fulvous fascia on the basal margin of the second and third segments; 

 the apical segments clothed with short pale fulvous pubescence, 

 bright fulvous at the apex ; the margins of the segments beneath have 

 a thin pale fringe. 



This species somewhat resembles H. laevigata, but the dark green 

 colour of the thorax, so finely and closely punctured, easily distin- 

 guishes it. The male I do not know. I possess three specimens ; 

 the description is drawn from one in the finest condition : the pu- 

 bescence is entirely hoary in one which had been longer disclosed. 1 

 received one specimen from Mr. Dale, captured at Barmouth ; one 

 from the Rev. Mr. Little, from Scotland ; the third was taken at 

 Hawley, Hants. I never met with it or knew it to be taken in the 

 vicinity of London. 



Sp. 19. Halictus lugubris. 



Melitta lugubris, Kirby, male. Melitta laevigata, Kirby, female. 



Halictus Icevigatus, St. Fargeau. 



Female. — (Length 4 lines). Black; the face has a very thin pale 

 fulvous pubescence. Thorax shining, punctate, the punctures large 

 and not very close, thinly clothed with ferruginous pubescence on the 

 sides and metathorax, the latter truncate ; the margin of the truncation 

 is produced laterally, forming a short tooth ; the tegulae nigro-piceous ; 

 the wings subhyaline, slightly clouded at their margins ; the pubescence 

 on the legs is rufo-fulvous ; the scopa is bright golden yellow ; the 

 tarsi bright fulvous beneath ; the claws ferruginous. Abdomen smooth, 

 bright and shining, and having a few scattered punctures; a little 

 rufo-fulvous pubescence at the base ; the basal margin of the second, 

 third and fourth segments has a fascia of pale rufo-fulvous pubescence, 

 the first usually and the second also frequently interrupted ; the apex 



