CCELODIAZE8I8 1035 



Length : Body about 5 mm. ; wing 4.5 mm. 



Life history and habits unknown. 



Eastern North America. 



Ottawa, Ontario, August 23, 1900 (A. Gibson), August 16, 1900 (J. A. 

 Guignard) ; Auburndale, Massachusetts, September 11, 1907 (C. W. Johnson) ; 

 Westfield, Massachusetts, August 23, 1903 (P. Knab) ; Addison, Alexandria 

 County, Virginia, November 7, 1909 (A. N. Caudell) ; Little Eock, Arkansas 

 (J. K. Thibault, Jr.) ; Terrebonne, Louisiana, March 29, 1901 (G. E. Beyer) . 

 Eeported also from Lake Simcoe, Ontario (Theobald) . 



Theobald, in 1903, expressed the opinion that Anopheles walkeri is a synonym 

 of the European A. iifurcatus (L) . and since then it has been treated as such by 

 most writers. There can be little doubt, however, that the two are distinct 

 although very similar in most respects. Our species has the palpi distinctly 

 ringed with white, while A. Iifurcatus is stated to have the palpi uniformly dark 

 scaled. The most striking point of resemblance is the absence of distinct wing- 

 spots. Anopheles walkeri shows only a very slight tendency toward the massing 

 of scales at the bases of the fork-cells, such a conspicuous characteristic for 

 quadrimaculatus, occidentalts and the European maculipennis. There is some 

 variation; some specimens of walkeri show hardly a trace, and none approach 

 quadrimaculatus in the development of the scale-spots. Of our species, A. 

 walkeri most resembles A. atropos in the scaling of the wings. The latter species 

 also shows indications of whitish rings on the palpi, but may be distinguished 

 at once by the very dark body coloring and particularly by the dark scaling of the 

 mesonotum and the absence of white scales from the vertex. 



The species is widely distributed in eastern North America, as will be seen 

 from our locality records. Beyer, in 1901, reported it, as an unidentified species, 

 as occurring in abundance in a locality on the coast of Louisiana ; we have one 

 of his specimens taken at that time. Since then only isolated specimens have 

 come to hand. 



Genus CCELODIAZESIS Dyai & Knab. 



Omlodiazesis Dyar & Knab, Journ. N. Y. Bnt. Soc, xiv, 177, 1906. 



Anopheles CoquiUett (in part), U. S. Dept. Agr., Bur. Ent, Tech. Ser. 11, 12, 1906. 



Anopheles Dyar & Knab (in part). Can. Ent., xxxix, 48, 49, 1907. 



Anopheles Williston (in part), Man. No. Am. Dipt., 3 ed., 107, 1908. 



Cyclophorus Eysell, Arcli. Schiffs- u. Trop.-Hyg., xvi, 421, 1912. 



The type species are, of Cwlodiazesis Dyar & Knab, Anopheles barberi 

 CoquiUett; of Cyclophorus Eysell, Anopheles nigripes Staeger. 

 Geneeic Diagnosis of Adult: 



Proboscis rather long and slender; palpi long in both sexes, slender in the female, 

 enlarged at the tip in the male. Antennae filiform in the female, the joints with 

 basal whorls, plumose in the male, the joints short, the last two long. Prothoracic 

 lobes remote dorsally, small. Mesonotum convex, rounded, not markedly narrowed 

 or elongate; scutellum collar-like, not lobed. Postnotum nude. Abdomen sub- 

 cylindrical, blunt at the tip in the female, depressed and with lateral ciliation in the 

 male. Wings with the second marginal cell long and with short stem. Legs long 

 and slender; the claws simple in the female, the male with one of the front claws 

 large and toothed, the other minute. 



Geneeic Diagnosis op Larva: 



Head elongate, the antennae rather small, smooth, the head turning easily on the 

 neck; mouth parts adapted essentially for vegetable food, the brushes moderate. 

 Air tube sessile, broad. Abdomen with a dorsal series of short lamellate tufts for 

 attachment of the body to the surface film of the water. Abdominal segments 1-6 

 with long ciliate lateral hairs. Lateral plates of the eighth segment with a row of 

 long teeth posteriorly. Anal segment with a chitinized dorsal plate, the ventral 

 brush large, strongly feathered. 



North temperate zone. 



The genus Coelodiazesis was founded on certain larval characters. It was 

 later suppressed ; but we resurrect it, as the genus can be recognized in the imago 



