282 LEPTID.E 



thoracal squamfe absent, leaving only tlie linear bare yellow frenum. 

 Halteres dark orange, 



? . Rather like the male. Frons about one-fifth the width of the head, greyish 

 white, parallel-sided from the upper ocelli to the transverse suture just 

 above the antennas, and with a few extremely minute black and yellow 

 bristles about the sides ; l^ack of the head all puffed out and the eyes (in 

 profile) more regularly oval ; pubescence on the jowls and lower part of the 

 back of the head conspicuously long and whitish ; occiput with rather 

 indistinct blackish spaces near the top corners of the eyes, and bearing 

 several irregular rows of black bristles ; ocellar space elevated, rather 

 blackish, and bearing black and yellow short bristles as in the male. Eyes 

 smaller and more oval ; facets all small and equal ; in life brown with a 

 faint gloss of green. Antennae with the second joint hardly stouter than 

 the others but more ferruginous about its tip. 



Thorax with shorter and less abundant pubescence than in the male, 

 especially on the disc ; humeri and the space from them to the wing-base 

 rather luteous. Scutellum dull luteous even to (or almost to) the base. 



Abdomen black and orange, moderately shining, the black colour consisting 

 of large badly defined dorsal triangles on the second and third segments and of 

 most of the subsequent segments except the rather broad hindmargins ; 

 pubescence all yellowish except for a few depressed black hairs on the disc 

 mainly about the hindmargins. Belly obscure blackish, l)ut most of the 

 second segment orange. Ovipositor (not including the tubular abdominal 

 segments) yellow, with a pair of outspread oval brownish yellow lamellae. 



Legs usually rather paler than in the male, the rings on the front and 

 hind femora being usually less dark and less defined ; coxa3 and trochanters 

 more ferruginous ; front tibiae slightly darkened at the tip, but the hind tibiae 

 less darkened there than in the male. 



Wings and veins less dark ; stigma more brownish. Squamae paler. 



Length about 6 mm. 



This species may be distinguished by its small size, its immaculate 

 wings except for the conspicuous stigma, and its pale pubescence from all 

 other British species except L. monticola, and from that it may be dis- 

 tinguished by its paler legs and abdomen ; it is however probable that 

 L. mo7iticola is only a dark mountain form of it. 



L. lineola is not at all uncommon in England, but is apparently much 

 more common in Scotland or perhaps Ireland. I have English records 

 from Devon, Dorset, Hampshire, Sussex, Surrey, Middlesex, Suffolk, 

 Hereford, Gloucester, Lancashire, and Cheshire; AVelsh ones from 

 Glamorgan and North "Wales; Scotch ones from Argyll, including the 

 Isle of Jura, Haddington, Fife, Perth, Banff, Elgin, Nairn, Inverness, and 

 Sutherland ; and Irish ones from several localities in Co. Kerry. It 

 usually occurs on shrubs in leafy glades in woods where it may be seen 

 playing about on leaves in the sunshine, or it may occur on tree-trunks 

 like L. scolopacea. My dates range from June 6 to September 14, but 

 a specimen occurred in a small conservatory at Denmark Hill as early 

 as March 15. It is recorded from extreme North Europe to at least 

 Austria, but may be replaced further south by L. monticola. 



7. L. monticola Egger. Eather small species allied to L. lineola but 

 with the abdomen and femora mainly blackish brown. 



Probably only a dark mountain form of L. lineola. 



(^, Face grey, side-cheeks lighter but not so light as in L. lineola and -with 

 their pubescence yellower ; hairs on the vertex all black ; frons brownish 



