AEDES KNABI 841 



AEDES KNABI (Coquillett) Dyar & Knab. 



Culex knaM Coquillett, Proc. Ent. Soc. Wash., vil, 183, 1906. 



Aedes knabi Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 203, 1906. 



Aedes knaM Dyar, Proc. Ent. Soc. Wash., vlii, 16, 1906. 



Ochlerotatus knabi Coquillett, U. S. Dept. Agr., Bur. Ent., Tech. Ser. 11, 18, 1906. 



Oulex knabi Theobald, Mon. Culic, v, 612, 1910. 



Obiginal Descbiption op Culex knabi: 



Proboscis and palpi black-scaled; head, thorax and scutellum yellow, their scales 

 and hairs golden yellow, pleura with a few patches of white scales. Abdomen 

 purple-scaled, front angles of the segments yellow-scaled; venter yellow-scaled and 

 with an apical band of purple ones on the last four segments. Femora and tibiae 

 purple-scaled, the basal half of the hind femora and the bases of the others, espe- 

 cially on the posterior side, yellow-scaled; bases of the first three tarsal joints 

 white-scaled, covering nearly the whole of the first two joints on the middle and 

 hind tarsi, scales on remaining portions of tarsi purple; all tarsal claws toothed. 

 Wings hyaline, the scales brown. Length 5 mm. 



Tehuantepec, State of Oaxaca, Mexico. Seven females collected by Mr. Frederick 

 Knab, for whom this elegant species is named. 



Type.— No. 8289, U. S. National Museum. 



Descbiption of Female and Labva of Aedes knabi (Male Unknown) : 



Female. — Proboscis rather stout, subcylindrieal, slightly enlarged at tip; 

 labellse conically tapered; vestiture black; setae rather long, curved, black, those 

 on labellse shorter and more prominently outstanding. Palpi moderate, over 

 one-fourth as long as the proboscis; vestiture black, setae moderate, stiff. 

 Antennae filiform, the joints subequal, rugose, coarsely pilose, b^o^vn; second 

 joint slightly enlarged medianly, yellow on basal half ; tori subspherical, with a 

 cup-shaped apical excavation, entirely ochraceous, a few fine black hairs on inner 

 side ; hairs of whorls rather short, sparse, black. Clypeus roundedrtriangular, 

 prominent, brownish-luteous, nude, shining. Occiput yellowish, brown in the 

 middle, clothed very broadly with narrow, curved scales on the vertex, flat ones 

 on the sides, light golden yellow; cheeks and under surface yellowish-silvery 

 scaled ; many erect forked golden scales on nape ; bristles along margins of eyes 

 black, those projecting forward between the eyes golden. 



Prothoracic lobes elliptical, remote dorsally, yellow, clothed with a few 

 golden scales and brown bristles; mesonotum ocher yellow, rather densely 

 clothed with narrow curved golden scales, two narrow, submedian longitudinal 

 lines of slightly darker integument, nude on anterior margin, clothed with 

 golden scales and some narrow hair-like black scales intermixed; bristles 

 over roots of wings and about antescutellar space golden. Scutellum trilobate, 

 pale luteous, each lobe with golden scales, broad on the mid-lobe, and a large 

 group of yellow bristles. Postnotum elliptical, prominent, pale luteous, nude. 

 Pleuras and coxae ochraceous, clothed with small patches of triangular, flat white 

 scales and rows of pale bristles. 



Abdomen subcylindrieal, tapering posteriorly ; dorsal vestiture black with a 

 submetallic violet reflection, a row of segmentajy, lateral, basal, subquadrate 

 yellowish-silvery or golden patches, becoming larger on posterior segments and 

 dorsally visible on five, six and seven ; eighth segment with broad basal golden 

 band dorsally; first segment mostly dark-scaled and with many fine pale hairs; 

 venter with vestiture violet-black, with golden segmental basal bands becoming 

 much broadened at the sides. Cerci black. 



Wings rather narrow, hyaline, slightly infuscated towards costa; petiole of 

 second marginal cell shorter than its cell, that of second posterior cell about 

 equal to its cell ; basal cross-vein more than twice its own length from anterior 

 cross- vein; scales of veins dull brown, those on costa blue-black, the outstanding 

 ones narrowly ligulate, denser on second vein. Halteres whitish, knobs with 

 yellowish white scales. 

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