108 MAJOR E. E. AUSTEN. 



Genus Culicoides, Latr. 



Synoptic Table. 



The eight species described or recorded below are mutually distinguishable 

 as follows : — 



1 (4) Wings entirely devoid of markings. 



2 (3) IMesonotum and crown of head olivaceous black . . . . vitreipcnnis, sp. n. 



3 (2) Mesonotum and crown of head gre}' (greyish olive) . . puripennis, sp. n. 



4 (1) Wings with markings. 



5 (8) Pale markings on each wing (other than any that there may be at the extreme 



base) limited to two more or less conspicuous spots or flecks on or close 

 to costal border. 



6 (7) Pale wing-markings on costal border clearly defined and conspicuous ; 



mesonotum cinnamon-coloured . . . . . . . . tentorins, sp. n. 



7 (6) Pale wing-markings on or near costal border inconspicuous, and from certain 



angles visible with difficulty ; mesonotum dark mummy-brown 



odiatus, sp. n. 



8 (5) Pale markings on each wing (other than those at the extreme base) not 



limited to two spots or flecks, but much more numerous and extensive. 



9 (10) Wings each with three dark blotches on costal border, of which at least 



the two more distal are (as seen against a light background) conspicuously 

 darker than those elsewhere . . . . . . . . newsteadi, sp. n. 



10 (9) Wings not so marked ; darker blotches on costal border (as seen against a 



light background) not conspicuously deeper in tint than those elsewhere. 



11 (12) Mesonotum unicolorous .. .. .. .. . . guttularis,K.\c.^er. 



12 (11) Mesonotum not imicolorous. 



13 (14) Mesonotum with light grey markings on a dark brown ground ; wings 



with pale spots at their distal extremities directly in contact with the 

 wing-margin, no dark spot in contact with anterior transverse vein 



odihilis, sp. n. 



14 (13) Mesonotum speckled ; wings in each case with distal pale spot between 



rami of fourth longitudinal vein not directly in contact with wing-margin, 

 a small but conspicuous dark spot in contact with anterior transverse vein 



circumscriptus, Kieffer. 



Culicoides vitreipennis, sp. n. 



$. — Length (one dried specimen), from anterior margin of thorax to posterior 

 extremity of abdomen, 1 mm.; length of wing, 1-25 mm., greatest breadth of 

 wing, 0-6 mm. 



Wings hyaline, with a milky appearance hut entirely devoid of markings ; crown 

 of head and dorsum of thorax olivaceous black ; legs pale. 



Head : vertex sparsely clothed with short, ochreous hairs, space between upper 

 lobes of eyes with longer ochreous hairs ; face and proboscis dark brown ; inner 

 margins of upper lobes of eyes moderately wide apart ; palpi mummy-brown, third 

 segment oval, moderately swollen ; second segment of antennae (torus) mummy- 

 brown, relatively large (larger and darker than in the following species), flagellum 

 drab, tinged with brownish towards distal extremity, clothed with yellowish hair, 

 first five or six segments of flagellum more or less spherical in shape, more truncate 

 (more spherical) than in the following species. Thorax entirely without markings, 

 mesonotum sparsely clothed with short, ochreous hairs ; scutellum agreeing in colora- 

 tion with remainder of dorsum, and bearing one lateral bristle on each side, also 

 (apparently) one central bristle, as well as several short hairs. Abdomen (in dried 

 condition) blackish brown, clothed at distal extremity with yellowish hairs. Wings 



