154 CHIRONOMIDjE. 



b b b. Thorax pale, with three darker stripes. Species 132-136. 

 b b b b. Thorax pale, not striped. Species 137. 

 a a a a a. Fore tibia longer than the fore metatarsus by one-half. 

 b. Thorax not prolonged in front. 



c. Thorax black or grey, not striped. Species 138-147. 



c c. Thorax hoary, with three black stripes. Species 148, 149. 



c c c. Thorax pale, with three black or brown stripes. Species 

 150-153. 



c c c c. Thorax pale, not striped. Species 154. 

 b b. Thorax prolonged in front. Species 155. 

 a a a a a a. Fore tibia longer than the fore metatarsus by two-thirds. 

 b. Body black. Species 156-162. 



b b. Thorax hoary, with three black stripes. Species 163-167. 

 b b b. Thorax grey, with three black stripes. Species 168. 

 b b b b. Thorax with pale stripes; abdomen with pale bands. Species 



169-171. 

 bbbbb. Thorax pale, with three black or brown stripes. Species 



172-174. 



a a a a a a a. Fore tibia longer than the fore metatarsus by three- 

 fourths. 



b. Thorax black, or hoary. Species 175-178. 

 b b. Thorax pale. Species 179. 



aaaaaaaa. Fore tibia twice the length of the fore metatarsus. 

 b. Body black, or grey. Species 180-185. 

 b b. Thorax pale, with darker stripes. Species 186-188. 



1. dissidens, u. Mas, niger, thorace subcinereo vittis tribus nigris, 

 alis limpidis, venis subfuscis, halteribus /Mffifouque testaceis, femoribus, 

 tibiis posterioribus apice, iibiis anticis tarsisque nigricantibus. Long. 2 ; 

 alar. 4 lin. 



Male. Black. Antenna? with brown plumes. Thorax slightly grey, 

 with three black stripes. Wings limpid, with a blackish mark at the 

 base ; veins pale brown ; discal transverse veinlet rather darker than 

 the rest. Halteres testaceous. Legs testaceous; femora, tips of tlie 

 tibiee, tarsi, and fore tibiae blackish. 



Not common. (E.) 



2. punctipes ? Wied. Zool. Mag. i. 1. 65 (1816) ; Meig. bicolor ? 

 Meig. Zw. vii. 7. 134 (1838). Mas et Fcem. niger, alis albo-limpidis, 

 venis albicantibus, halteribus abdomineque viridibus, pedibus pallide tes- 

 taceis, tibiis apice paullo obscurioribus. Long. lf-2 ; alar. 3-31 Jin. 



Male and Fern. Black. Wings limpid-white ; veins whitish. Hal- 

 teres and abdomen green. Legs pale testaceous ; tips of tlie tibia ratJier 

 darker. Male. Antennae with brown plumes. 



Abundant in September. (E. S. I.) 



3. pusillus, L. S. N. ii. 975 (1767) ; F. ; Grael. ; Meig. ; Mcq. . ; 

 Zett. ; Giro. ; Staeg. Mas et Fcem. viridis, thorace vittis tribus nigris 



