8b* MANDIBULATA. KEUROfTERA. 



snow-white. The female has only two small luteous spots on the thoraxy 

 which are sometimes wholly wanting, and the thorax itself is red; the spots 

 on the abdomen are luteous, and the lower anal appendages are wanting ; 

 the wings are yellowish, especially at the base and towards the costa : in 

 one of my specimens they are very bright. 



Not very uncommon : found within the metropolitan district in 

 June at Hertford, Epping, &c. ; also in the New Forest and in 

 Devonshire. 



Genus XII.— CORDULEGASTER, Leach. 



Labium with its middle lobe flat, not transverse, somewhat rounded-quadrate, 

 with a faint longitudinal ridge, its edge with a very deep notch, its lobes 

 with an acute tooth : lateral lobes moderate, somewhat acuminated at the 

 apex and furnished with a long moveable process : labrum tumid, with a 

 deep marginal notch : mandibles acutely dentate : head semiglobose-trans- 

 verse : forehead very tumid and pilose : eyes scarcely contiguous : ocelli 

 placed in a curved transverse line, in a depression : body pilose : abdomen 

 glabrous, elongate, clavate : its apex in the males furnished with four short 

 acute appendages ; in the females, with two very long ones : wings rather 

 short and narrowish, the inner margin of the hinder pair obtusely angulated 

 in the maleSj and rounded in the females. 



This genus differs from the preceding, not only in having the 

 abdomen clavate in both sexes, but in the structure of the labium, 

 the central lobe of which is very deeply notched, with its two lobes 

 armed with a short acute tooth ; the posterior wings of the male are 

 strongly angulated on the inner margin, but rounded in the female ; 

 the anal appendage is very short in the male, but long and acumi- 

 nated in the female ; again the eyes are scarcely contiguous. 



Sp. 1. annulatus. Niger, Jiavomaculatus, thorace strigis dorsalihus Jiavis duabus, 

 iribusgue vtrinque lateribus media tenuiore, abdomine maculis cirigulisque 

 Jiavis. (Long. corp. 2 unc. 10 lin. — 3 unc. ; Exp. Alar. 3 unc. 6 — 8 lin.) 



JEsh. annulata. Latreille. — Co. annulatus. Steph. Caial. 309. No. 3432 — 

 Li. Boltoni. Donovan, v. xii. pi. 430. 



Head yellow, with a black spot on the crown, which has a yellow crest; 

 mandibles and a transverse line on the face above the labrum black, the 

 extreme base of the last, and a faint descending medial line also black ; eyes 

 brown, with a white streak behind ; collar spotted with yellow ; thorax 

 black, with two oblique yellow dorsal stripes, and three lateral ones, the 

 intermediate one narrow, and sometimes interrupted ; at the base of each 

 wing is a yellow dot, and sometimes one on the thorax, between the dorsal 

 and lateral stripes ; abdomen black, the basal segment with the sides, the 



