264 MANDIBULATA. HYIMEXOPTEKA. 



Sp. 94. bicolor. Niger, segmentis l-4>, Jemoribus, tihiisque riifis, harujn posticis 

 apice nigra. (Long. corp. 5 I'm.; Exp. Alar. 7§ lin.) 



Tr. bicolor. Gravenhorst, ii. 326. — Steph. Nomen. 2d edit. Gen. 715. 94. 



Black : antennae slender^ rather shorter than the body, rusty beneath towards 

 the apex ; abdomen with the basal segment slightly channelled, red^ 3 fol- 

 lowing also redj remainder black ; legs moderate^ 4 anterior red, with the 

 coxffi and trochanters black ; posterior black, tibiae red, the tip black ; wings 

 somewhat hyaline; cellule wanting. 

 Found, btit rarely, near London, in June and July.. 



Genus XLVI.— EXOCHUS, Gravenhorst. 



AntenncB short, straight, somewhat filiform^ composed of about 27 articu- 

 lations; Aeac? rather short, transverse, Jace more or less protuberant below 

 the antennae; eyes ovate, or somewhat orbicular: thorax cylindric, or 

 slightly gibbous : scutellum flattish, triangular : wings moderate, or smallish ; 

 cellule none, or small, 3-angular, and petiolated : abdomen somewhat sessile, 

 convex, oblong-cylindric, sometimes a little thickened, shining, smooth, the 

 basal segment slightly channelled, its lateral tubercles placed beyond the 

 middle: ovipositor generally concealed: legs short, robust, Jeyraora and tibice 

 a little compressed. 



This genus, as indicated by Gravenhorst, differs chiefly from the 

 preceding by having the legs short and thick, the face protuberant — 

 whence its name — and the abdomen somewhat sessile, oblong-cylin- 

 dric ; to which may be added the comparative brevity of the wings 

 and the smallness of stature : the insects are generally found amongst 

 grass, or on umbelliferous plants, during the summer and com- 

 mencement of autumn. 



§ I. Anterior wings with a small cellule. 



Sp. 1. frsenator. JViger sericeus, femoribus tibiisque riifis. (Long. corp. 2 — 3j 

 lin. ; Exp. Alar. 3^ — 5 lin.) 



Ex. frsenator. Gravenhorst, ii. 332. — Steph. Nomen. 2d edit. Gen. 716. 1. 



Black and silky: mouth reddish, with the tips of the mandibles black; 

 antennse about half the length of the body, the tip rather curved, beneath 

 more or less rusty-red ; abdomen a little narrower than the thorax, some- 

 what oblong or cylindric, the 2nd to 6th segments of equal width, the apex 

 a little thickened in the females, basal segment with 2 elevated lines, 

 remainder generally with the extreme edges reddish; legs shortish and 

 rather stout, red, with the coxae black ; trochanters either black with the 

 tip red, or entirely red ; tibise with the base in general either palish or 

 yellowish; wings hyaline; cellule small, irregular, obliquely transverse, 

 petiolated. 

 Not very abundant : taken at Darenth wood in June, and other 



places within the metropolitan district. 



