Heterogyna and Fossorial Hymenoptera. 273 



6th segment yellow, the band on the 4th segment some- 

 thnes continuous ; legs yellow ; the base of the femora 

 black. Head and thorax finely, closely, and rugosely 

 punctured, especially in the ? ; face below the antenna3 

 covered with long testaceous hairs ; antennae simple 

 in both sexes ; metathoracic basal area somewhat smooth, 

 depressed in the middle, and rugose, bounded by a narrow 

 consute line, sides finely hairy and rugose ; body shining, 

 with obsolete, scattered punctures on the 1st, 2nd, and 

 3rd segments, more closely punctured on the following, 

 petiole hairy ; apical segment in the ? finely striate, with 

 a few large punctures near the base ; 5th and 6th 

 segments in the ? and 7th in the (? more or less hairy ; 

 abdomen beneath with scattered hairs ; tibiae with pale 

 spines. 



Length, 3 8—11 mill., ? 13—15 mill. 



Ilah. — Common in many places, and generally dis- 

 tributed. 



2. salmlosus, Fabr. Mant. Ins. i. p. 296. Fig. Smith 

 Brit. Foss. Hym. pi. iv. fig. 4. 



Eather smaller than the above, with the head and 

 thorax less closely punctured ; markings white instead of 

 yellow ; 2nd and 3rd segments of the abdomen each with 

 a large transverse white spot on each side, the upper one 

 in the 3 often obsolete, a white band on the 5th segment 

 in the 2 and a spot on the 6th segment in the 3 also 

 white ; legs fulvous, not yellow, as in arvensis ,- antennae 

 fulvous, except at the base above ; ? with joints 8 — 11, 

 produced beneath, and subtuberculate, their lower mar- 

 gin dentate at the apex. 



Length, <? 8—9 mill., ? 12—13 mill. 



//rt&.— Generally distributed ; Suffolk, Hants, Notting- 

 ham, Newcastle ; sometimes very common, 



CEECEEID^. 



(2) 1. 211(1 subiuarginal cell petiolated Cerccris. 



(1) 2. 2nd submarginal cell not petiolated .. .. PltihnUhus. 



Cercekis, Latr. (PL VIII. fig. 42). 



Hist. Nat. Ins. xiii. p. 315. 



This is one of the most distinct genera of the Fossorial 



Hymenoptera ; the 1st segment of the abdomen is 



narrower than the rest, being little more than half the 



