CERATOPOGON. 205 



Antenna? yellow ; last joint brown. Thorax yellow. Mesonoturn with 

 three very broad black stripes, occupying almost the whole breadth ; the 

 lateral pair abbreviated before, the middle one extending from the pro- 

 notum to the black scutellum. Metanotum black. Pectus black-brown. 

 Wings with whitish gloss. Halteres white. Abdomen black, with 

 narrow whitish incisures ; under side dingy yellow, with the two last 

 segments black. Legs whitish ; tips of the joints, and three last joints 

 of the hind tarsi brown. 



Common from May to September about lakes and river. Buns 

 about in curves and circles with great rapidity on the large stones 

 on the banks. (E. S. I.) 



2. atomaria? Zett. Dipt. Scand. ix. 3522. 40 (1850). Mas, atra, 

 alis albis, clavo fusco basi pallido, venis halteribus pedibusque albidis ; 

 Fcem. flava, fronte verticeque nigro-fuscis, thoracis vittis tribus, scutello 

 et inetanoto fuscis, scutelli basi flavo, alis flavescentibus, clavo basi pal- 

 lido apice fusco, halteribus pedibusque pallidis, abdomine fasciis pallide 

 fuscis. Long. -^ ; alar, -f- lin. 



Male. Deep black. Wings white ; clavus brown, pale at the base ; 

 veins, halteres, and legs whitish. Fern. Yellow. Front and vertex 

 blackish-brown. Whorl of the last joint of the antennas very short. 

 Mesonotum with three brown stripes, the middle one behind, the others 

 before, abbreviated. Scutellum and metanotum brown, the former 

 yellow at the base. Wings yellowish ; clavus pale at the root, black- 

 brown at the end. Halteres and legs pale. Abdomen with light brown 

 bands on the hind borders of the segments. 



Not rare about ponds, etc. (E. I.) 



Obs. Corynoneura scutellata, "Winn. (Ent. Zeit. Stett. vi. 13 

 (1846),) seems to differ from this in having a costal clavus like 

 that of the preceding species. Chironomus minutus, Zett. (Dipt. 

 Scand. 3522. 39), is probably a Corynoneura, differing from C. mi- 

 nutissima, the female being blackish, like the male. 



Genus IV. CERATOPOGON. 



CERATOPOGON, Meig. Klass. i. (1804); Wied. ; Panz. ; Mcq. ; Gim. ; 

 Zett.; Sta3g. ; Rs.; Winn. Oulex p., L.; F.; Gmel.; Meig. Klass.; 

 Lam. Tipula p., Gmel. Chironomus p., F. ; Latr. Trichocera, 

 Lam. Ciilicoides, Latr. Palpomyia, Meg. Serromyia, Meg. Jor- 

 cipomyia, Meg. Sphceromias, Steph. ; Curt. ; Hal. Labidomyia, 

 Steph. 



Corpus parvum aut minimum, pilosum aut nudum. Caput anticum 

 ssepissime depressum. Oculi lunati, subreniformes. Proboscis por- 

 recta, plus minusve producta, labro, lingua et maxillis corneis acu- 

 minatis. Palpi 4-articulati. Antennae 13-articulata3, filiformes; 



