CHIKONOMUS. 193 



GROUP , 2. 



Hydrobanus, Fries, Kongl. Vet. Acad. Handl. 1829. 176. Psilocerus, 

 Ruthe, Isis, 1831. 1207. 



This group only contains the following species, which inhabits 

 several parts of North Europe, but has not yet been certainly 

 found in Britain. 



188.* lugubris, Fries, Kongl. Vet. Acad. Handl. 1829. 176 (1829). 

 occultans, Meig. ; Ruthe ; Zett. Ater, opacus, alis nigricantibus, 

 pedibus piceis. Long. lin. 



GROUP 3. 



189. lacustris, Hal. Westw. Class II. Syn. Gen. Brit. Ins. 125 

 (1840). Prasinus, raesonoti vittis tribus et pectore carneis, alis albidis 

 nudis, tibiis anticis fuscis. Long, mas 2, fcem. 1 J ; alar. 3 lin. 



Light grass-green. Palpi dusky, except the base. Three confluent 

 stripes on the mesonotura and the mesosternura (flesh-colour or) ferru- 

 ginous, also the mesothorax, dusky at the tip. Wings whitish-hyaline, 

 naked ; veins light yellowish. Halteres pale. Fore tibiae and fore 

 tarsi, except the base, dusky; posterior tarsi dusky only towards the 

 end ; first joint of fore tarsi twice as long as the tibia in the female, 

 more elongated in the male ; fifth joint not half as long as the fourth. 

 Male. Antennae twelve-jointed, dingy yellow, with yellowish plumes ; 

 last joint much longer than the rest together. Fern. Antennae seven- 

 jointed ; the last joint dusky, linear, one-third of the length of the en- 

 tire antenna. 



Pound by Mr. Haliday by Loch Pad (Bute), Lough Neagh, 

 and Lough Dirg. (S. I.) 



GROUP 4. 

 Diamesa, Meig. Zw. vii. 12 (1838); Zett.; Stseg. 



190. obscurimanus, Meig. Zw. vi. 248. 88 (1830). Fcem. ob- 

 scure testaceus, palpis antennisque nigris, thorace vittis tribus piceis, alis 

 cinereis, venis halteribusque albidis, illis apud discum nigris, abdominis 

 segmentis testaceo-marginatis, pedibus fulvis, tarsis nigris. Long. 3 ; 

 alar. 6 lin. 



Fern. Dark testaceous, shining. Palpi and antennae black, the latter 

 seven-jointed, testaceous at the base. Thorax with three piceous stripes, 

 the middle one subdivided. Wings grey ; costal, radial, and cubital 

 veins, and praebrachial transverse veinlet black, the rest whitish ; pobra- 

 chial areolet closed before the fork of the pobracJdal vein (as in Tanypus 

 punctipennis, etc.). Halteres whitish. Abdomen black ; hind borders of 

 the segments testaceous. Legs tawny, rather stout, minutely pubescent ; 



* Since the Synopsis, p. 152-154, was printed, the species numbered 188 has been 

 ascertained to belong to the genus Corynoneura. 



VOL. IV. 2 C 



