1884.] 151 



the sides rugosely strigose ; wings darker than in any of tbe other species ; 2nd 

 }ub-marginal cell shaped much as in the J ; abdomen shining, indistinctly punctured ; 

 ipical dorsal valve with a very narrow glabrous centre ; spines along the external 

 margin of the tibiae black. Length, 8—10 mm. 



A common species, I believe. I have taken it commonly at 

 Chobham, and received it from Norwich (J. B. Bridgman), Colchester 

 (W. H. Harwood), Gloucestershire (V. E.. Perkins), Guestling, near 

 Hastings (Rev. E. JST. Bloomfield), Exeter (E. Parfitt), Penzance (E. 

 D. Marquand). 



2. reiiculatus, Thorns., Opusc. Ent., 98, 3 ; Hym. Scand., ii, p. 155. 



V. Hag., Deutsche Ent. Zeit., xxvi, 1882, pi. vi, f, 5. 

 Very like the preceding, but rather smaller, and the puncturation of the thorax 

 in both sexes rather less coarse. <? with the antennae neither quite so long nor so 

 thick as in gihhus, each joint with the basal pubescent band much narrower ; an- 

 terior-wings with the 2nd sub-marginal cell very narrow, its sides sub-parallel, 

 ilmost twice as long as wide ; abdomen shining, less strongly punctured than in 

 fibhiis ; the armature quite differently formed : the lacinia being produced into a 

 simple point, with a sub-membranous wing along its inner margin. 



?. differs from gihhus in its narrow 2nd sub-marginal cell, its less smoky wings, 



the reticulated (not strigose) sides of the metathorax, the wider sub-carinated dorsal 



(ralve of the abdomen, and in the much more finely punctured, less shining, and grey 



pubescent 4th segment ; the black of the apex of the abdomen also does not extend 



an to the apex of the 3rd segment, as is usually the case in gihbus. 



Length, 7 — 9 mm. 



I took a few males in August this year at Chobham, flying over 



a sandy bank, and find a ? mixed with suhquadratus taken at Chobham 



in 1873. I think it must be local, as I have not received it from any 



correspondent. 



3. suhquadratus, Sm., Zool., iii, p. 1014, f. 5. E. Saund., Trans. Ent. 

 Soc, 1882, p. 197, pi. viii, f. 2. v. Hag., Deutsche Ent. Zeit., 

 xxvi, 1882, pi. vi, f . 6. 



Just like the preceding in colour, but distinguished in both sexes by its rather 

 Arger size, and much wider 2nd sub-marginal cell j in the $ also by the bifid lacinia 

 Mid very different shape of the armature ; and in the ? by the incrassate vertex, 

 lohe strigose metapleurse, the wide flat dorsal valve, and the pale tibial spines. 



Length, 8 — 10 mm. 



A common species and widely distributed. Chobham ; Norwich 

 (J. B. Bridgman), Hastings (Eev. E. N. Bloomfield), Penzance (E. 

 D. Marquand), Lundy Isle, nearly black ^ (F. Smith), Grloucester- 

 jhire (Y. E. Perkins), Dumfries (E,. Service), Colchester (W. H. 

 Harwood), Hampstead (T. E. Billups). 



{To be conclucUd in our next). 



