320 SYSTEMATIC ARRANGEMENT 



singular insects, and he concluded that they helong 

 to the hymenopterous order. This he was induced 

 to do chiefly by the circumstance of their heing para- 

 sitic, in the larva state, on the bodies of various kinds 

 of bees and wasps (Andrenidce and Vespidce). The 

 larva and pupa of Stylops are figured at B and C, 

 PI. XXXIII. They live between the abdominal 

 segments of the bee, as represented in fig. A, a b. 

 An interesting account of the discovery of an English 

 species of this order will be found in Kirby's Mono- 

 graphia Apum Angliae, II. 113, and a full description 

 of the order, in his Memoir in the XL volume of the 

 Linnsean Transactions. 



As at present known, the order may be regarded 

 as comprehending four genera. These may be dis- 

 tinguished by the antennae : Halictopkagus has four 

 branches in these organs, in all the rest only two 

 exist. In Xenos the antennae are inarticulate; in 

 Stylops the outer branch is flattened and three-jointed, 

 this is likewise the case with Elenchus, but the joints 

 are very long and slender. 



STYLOPS DALII. 



PLATE XXXIII. Fig. 1. 



Curtis* Brit. Ent. Vol. v. fol. 226. 



BODY of a deep velvet black. Scutellum at the base, 

 and abdomen at the sides, ochre yellow ; wings white 

 and iridescent ; legs brownish. Length about a line 

 and a half. 



Obtained from Andrena barbilabris by Mr. Dale, 

 after whom the insect is named. 



