320 
SYSTEMATIC ARRANGEMENT 
singular insects, and he concluded that they belong 
to the hymenopterous order. This he was induced 
to do chiefly by the circumstance of their being 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 Anglise, II. 113, and a full description 
of the order, in his Memoir in the XI. volume of the 
Linmean Transactions. 
As at present known, the order may be regarded 
as comprehending four genera. These may be dis- 
tinguished by the antenna : Halictophagus 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. Yol. 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. 
