758 MOSQUITOES OF NORTH AMERICA 



AEDES DIANT^US, new species. 

 Description of Male of Aedes diant^us (Female and Larva Unknown) : 



Male. Proboscis long, slender, straight, black. Palpi slightly exceeding the 

 proboscis in length, blunt at apices ; vestiture brownish-black ; end of long joint 

 and last two joints slightly enlarged, with dense, moderately long, black hairs. 

 Antennae plumose, the last two joints long and slender, rugose, pilose, black, the 

 others short, pale, with blackish rings ; hairs of whorls long, black with brown 

 silky luster. Occiput black, clothed with narrow, curved, creamy-yellow scales 

 above, the sides with broad, flat, dull white scales; nape with many short, 

 upright, forked, creamy-yellow scales ; a row of long black bristles along mar- 

 gins of eyes, those projecting forward between eyes pale yellow. 



Prothoracic lobes elliptical, remote dorsally, brownish, clothed with narrow 

 curved, creamy-yellow scales and with a few black bristles. Mesonotum clothed 

 with rather coarse, narrow, curved, creamy-yellow scales and with two narrow 

 submedian lines of brownish-black scales which are smaller and denser. ( Scutel- 

 lum and posterior portion of mesonotum denuded.) Postnotum nude, deep 

 brown. Pleurae deep brown, coxae luteous; clothed with flat white scales, the 

 prothoracic epimera with narrow, curved, creamy-yellov/ scales. 



Abdomen elongate, depressed; dorsal vestiture black, with narrow, whitish, 

 basal segmental bands, obsolete centrally; venter whitish scaled, the segments 

 with apical, median black spots ; lateral eiliation moderately long and abundant, 

 brownish-yellow. 



Wings narrow, hyaline ; stems of second marginal and second posterior cells 

 longer than their cells ; basal cross- vein more than its own length from anterior 

 cross-vein; vestiture sooty brown with a few pale scales intermixed, rather 

 sparse ; outstanding scales linear. 



Legs rather long and slender; vestiture sooty brown, the femora pale beneath 

 to near apices; knees pale scaled; tarsi entirely dark scaled. Claw formula, 

 1.1-1.1-1.1. 



Length : Body about 6 mm. ; wing 5 mm. 



Genitalia (plate 24, fig. 167) : Side-pieces nearly three times as long as wide, 

 rounded at tip; apical lobe roundedly prominent, without basal prolongation; 

 basal lobe digitate, appressed, with a side-piece bearing two stout apical setae. 

 A group of dense hairs arising at origin of apical lobe. Clasp-filament long, 

 slender, with two small setae towards tip arising from slight notches; a long 

 articulated terminal spine. Harpes elliptical, concave, inner margin thickened 

 and revolute, tip pointed and outcurved. Harpagones with a long stem, its 

 basal and larger portion thick, angular and bearing a few setae, apical portion 

 slender, with a broad terminal filament which is expanded at tip, the angles of 

 the expansion pointed, the termen emarginate. Unci approximated, revolute, 

 forming a basal cylinder. Basal appendages approximate, bearing several short, 

 stout setae. 



Type: No. 12678, U. S. Nat. Mus. 



The larvas develop in the early spring pools left by the melted snow, hatching 

 frorn overwintering eggs. There is but a single generation in the year. The 

 habits, so far as known, are the same as those of the other early spring species, 

 with which they occur, the adults flying in the woods till midsummer. 



New Hampshire. 



Dublin, May and June, 1909 (A. Busck). 



The present species is clearly distinct by the male genitalia, which are allied 

 to those of Aedes impiger, yet markedly different. Two males before us show 

 these characters, and have been made the types of the species, yet unfortunately 

 they are so badly preserved, that it is nearly impossible to determine their 

 markings and coloration. For this reason we are not able to positively identify 

 any female specimens as belonging here. 



