I 



l'.i21.| 



173 



^^•3 (14) Acrosticlial bristles strong and biserial, with the rows close together 



.... *I4. hiseriata Stein. 

 S- Frons wide, at narrowest part 2-2| times as wide as third 

 antennal joint. Frontal orbits fairly wide and very silvery viewed 

 from above, the frontalia also glossed with silver when viewed from 

 in front. Third antennal joint about half as long again as second; 

 arista only microscopically pubescent. Thorax brownish-grey on 

 disc, but lighter grey almost all round marg-in, including a broad 

 grey patch in front of scutellum ; .scute) lum grey except at base and 

 sides. Abdomen, viewed from behind, with all except the hind 

 margin of lirst segment darkened ; 2nd and 3rd segments each with 

 two small, widely separated, somewhat triangular dark patches 

 • (smaller on the third segment) ; fourth segment with two very small 

 faint spots near hind margin. Front tibiae with or without a small 

 bristle behind; middle tibiae with J -2 small bristles behind; hind 

 tibiae with two small antfroventral and two rather larger anterodorsal 

 bristles, also 1-2 small posterodorsal bristles may usually be traced 

 mixed with the short hairs. Hind femora with only 2-3 antero- 

 ventral bristles towards tip, and 2-3 rather conspicuous long postero- 

 ventral bristles near base. Wings very faintly greyish. Squamae 

 whitish yellow. Hal teres yellow. 



5 . Interfroutalia grey, considerably extended but not to front of 

 frons, frontal orbits wide and greyish. Thorax slightly darker grey 

 without conspicuous stripes, though sometimes brownish about 

 middle of each row of doi-socentral bristles. Abdomen same colour 

 as thorax, with a pair of small but conspicuous rounded brown spots 

 on 2nd and 3rd segments, and much fainter smaller spots on first 

 segment. Ovipositor with hairy lamellae and not armed with spines. 

 Legs as in male, including 2-3 rather conspicuous posteroventral 

 bristles or bristly hairs near base of hind femora. 



Length 3-5-5 mm. 



This species occurs on the sea-coast, and has been taken at 

 Gravesend,(Kent), Frinton-on-Sea (Essex), and Aldeburgh (Suffolk) 

 by Col. Yerbury, Col. Nurse, and Mr. C. G. Lamb in June, July, and 

 September ; while I found it comparativeh' common on Blankeney 

 Point (Norfolk) in August 1920. 



34 (11) Frons wide, three times (or more) wider than third antennal joint. 



35 (36) Thorax and scutellum entirely dove-grey. Interfrontalia hardly 



produced beyond ocellar triangle . . 15. solitariana, n. n. 



solitaria auct. 7iec Zett. 

 (S . Frons about 3^ times as wide as third antennal joint (about 

 f the width of head). Frontalia at narrowest part rather more than 

 twice as wide as a frontal orbit. Jowls below eyes not quite so wide 

 as frons. Thorax very light grey and unicolorous when viewed from 

 in front, more slaty-grey when viewed from behind. Scutellum of 

 same colour as thorax. Abdomen not flattened, in profile almost 

 equally deep at base and tip ; first segment not conspicuously 

 darkened ; 2nd and 3rd segments each with a pair of triangular 

 dark patches very little different in size ; 4th segment with indica- 

 tions of much .smaller dark patches. Hind femora with 3-4 long 



