94 MANDIBULATA. — HYMENOPTEIIA. 



Genus XXV.— HETERARTHRUS* mUd. 



Antenna 12- to 15-jointed, the 1st and 2nd short, 3rd nearly twice as long aa 

 the 4th, remainder short and distinct: ivings ample; anterior with 2 mar- 

 ginal areolets and 4 submarginal ones, the transverse nervures which form 

 the first areolet only commenced; the 2nd areolet receiving 1 recurrent 

 nervure ; the 3rd receiving 2. 



I have employed the above generic name to designate the only 

 British species of this genus, inasmuch as I have not seen the insect, 

 and without a comparison of it with the other discordant Tenthredini- 

 deous insects included by Klug in his division, none of which I 

 know, I am at a loss to say how far it may differ in habit — the 

 British species forms the type of the genus Decatria (Westwood), 

 which name, of course, may be eventually employed, should the 

 insect prove different from the other species alluded to above. 



•|Sp. 1. ochropoda. Niger, nitidiis, antennarum articulis 'S.-hus hasnlibus pedi- 

 busqiie Jlavescentibus, alls {^prcesei'tim ad basin) infumatis, antennis 13-articu- 

 latis. (Long. corp. 2f lin. ; Exp. Alar. 5g lin.) 



Te. (Emp.) ochropoda. Klug Blattw. 211. — Decatria fuscipennis. Westwood, 

 in Lardner's Cyclop, (adhuc inedit.) — Het. ochropoda. Steph. Nomen. 2d 

 edit. Appendix. 



Shining black: 2 basal joints of the antennae pale yellow; mandibles brown, 

 with the base white ; wing scales and metathoracic tubercles white ; coxse 

 and trochanters black, the latter pale yellowish at the tips ; femora and 

 tibise yellowish, the latter palest at the base ; wings dusky at the base, 

 hyaline at the apex. 

 There was a specimen of this species in Mr. Ingpen's collection, 



which I believe he found in Kent. 



Genus XXVI.— MELICERTAf mihi. 



A?itenncE slender, the 2 basal joints short, of equal length, the 3rd linear, 

 nearly as long again as the 4th, the 5th and 6th almost equal in length, and 

 rather shorter than the 4th (remainder broken oiF) ; labrum transverse, 

 entire : clypeus not emarginated : head broader than the thorax, slightly 

 produced in front between the eyes, the latter rather large : ocelli 3 : thorax 

 somewhat globose : wings shortish ; anterior with 2 marginal areolets, the 

 basal one small, ovate-triangular, the other ample, and 3 submarginal ones, 

 the 1st elongate curved, receiving 1 recurrent nervure; 2nd shorter, some- 



'ErspoTijs diversitus, apOpov articulus. f Melicerta, Nomen viri. 



