432 



I have obtained from Mrs. A. T. Slosson the specimen upon which 

 the recorded occurrence of nivcipcnnis Fabricius in this country is 

 based, and find that it is a female of lobifcriis. Its locaHty is Charlotte 

 Harbor, Fla. 



Section II 

 Abdominal segments ivitliout dorsal depression 



Subsection 1 



Fore tarsi ivitli tlie basal joint not ynore 

 tlian 1.5 as long as fore tibia' 



II. Chiroxomus flavicingula Walker 



Chironomus fiavicingula Walker, List Dipt. Brit. Mus., Vol. 1, p. 20. 1848. 



Larva. — Length, 11-12 mm. Blood-red. Head brown; antenna 

 rather short, the apical process with five distinct joints instead of the 

 normal four (PI. XXX, Fig. 10) ; labium as in Figure i, Plate XXIX. 

 Ventral blood-gills present, both pairs well developed, the dorsal 

 blood-gills large, nearly as long as the pseudopods. 



Pupa. — Length, 8-9 mm. Reddish, becoming brown as it ma- 

 tures. Frontal tubercle as in Figure i, Plate XXXI. Thoracic respir- 

 atory organs white, hairlike. Second abdominal segment with the 

 normal apical transverse series of setul^e ; segments 2-6 with three 

 transverse patches of microscopic setulse, a narrow one near base, a 

 much broader one on middle, which contains a number of small 

 rounded bare spots, and another much narrower one near apex 

 (PI. XXXI, Fig. 4) ; apical lateral process of eighth segment not 

 elongated, armed apically with several short flat spines as in Fig- 

 ure 18; apical abdominal appendage normal. 



Imago; Male. — Opaque brown-black. Head and its members 

 black ; antennal plumes brown. Thorax with grayish pruinescence, 

 which is most distinct between the vittae, the latter opac{ue black. 

 Abdomen with very distinct white pruinescent hind margins to all 

 except the apical two segments. Legs yellow, coxae and femora 

 brown, the latter with a narrow yellow preapical band, tibiae broadly 

 brown at bases and narrowly so at apices, the hind pair with a median 

 brown band ; tarsi with the apices of the basal 3 joints, and the whole 

 of the apical 2, brown. Wings clear, veins yellow, cross vein con- 

 spicuously infuscated. 



Pronotum linear above, with a broad median division; mesono- 

 tum continued above pronotum. Seventh segment of abdomen not 



