CTILI8ETA INCIDENS 479 



Obioinal Description or Cuuex pabticeps : 



Male: Head brown, covered with yellowish scales, among which are some pure 

 white ones, few hairs along eyes black; proboscis dark brown, bearing a few 

 yellowish scales; palpi brown, base of each joint white; antennae Ijrown, lighter at 

 base; thorax brown, bearing yellow and white scales, the latter most prominent on 

 posterior part, pile black; halteres pale with brown knobs; abdomen brown, scales at 

 base of segments white, on remaining part of segments the scales are brown, a few 

 scattering ones yellow, venter almost wholly covered with white scales; fore coxae 

 brown, others rather pale; femora black, with the posterior side on basal half, and 

 a ring near apex white-scaled; tibiae black, with a few white scales; tarsi black, 

 with bases white; front and middle tarsal claws toothed, hind ones small and simple; 

 veins of wings light brown, bearing narrow brown scales, those on the anterior part 

 of wing intermixed with white ones; a spot at the origin of the second vein, the small 

 cross-vein, and a spot beginning at the base of first submarginal and crossing the 

 second submarginal and first posterior cells, clouded with brown; the cross-veins at 

 end of first and second basal cells approximated; petiole of the first submarginal cell 

 one-half the length of the cell. 



Female: Agrees with male, except has more long black scales on head, petiole of 

 first submarginal cell one-third the length of that cell; all tarsal claws simple. 

 Length, 8 mm. 



One male and six females; Arizona. Prof. F. H. Snow. 



Descbiption of Femam;, Male, and Laeva op Chliseta iNciDEiirs: 



Female. — Proboscis rather long, slender, uniform, flattened dorso-ventrally; 

 labellae long, tapered to tip ; vestiture black, with pale scales intermixed, particu- 

 larly towards base beneath. Palpi about one-sizth the length of proboscis, 

 vestiture black, with yellowish scales at bases of segments. Antenna filiform, 

 the joints slender, rather short, third joint about tibree times as long as wide, 

 succeeding joints successively longer and slenderer, with fine fuscous pubes- 

 cence ; tori globose, with an apical excavation, fuscous, a group of whitish scales 

 on inner side ; hairs of whorls black, short, sparse. Clypeus flattened, broadly 

 rounded, pruinose, black, without scales or hairs. Eyes black. Occiput clothed 

 with narrow, curved scales on vertex, dark brown before, pale yellowish behind, 

 those on border of eyes forming a whitish margin, many upright forked creamy 

 yellow scales dorsally, cheeks with broad, flat, white scales. 



Prothoracic lobes small, widely separated, pale sealed, with coarse, black, 

 curved setae intermixed. Mesonotum deep brown, sparsely clothed with minute, 

 hair-like, very deep brown scales and large, narrow, curved, shining yellowish 

 scales intermixed, which have a tendency to group in longitudinal series, form- 

 ing a double broad stripe before and two narrow interrupted stripes subdorsally 

 on posterior two-thirds, a pale marginal zone on anterior half, which is curved 

 inwardly to joint subdorsal stripes in front ; hind margin and bare space before 

 scutellum surrounded by yellowish scales. ScuteUum whitish scaled, with black 

 setae in three groups. Postnotum nude, piceous. Pleurass dusky brown, coxae 

 luteous, with patches of pale scales and rows of pale bristles. 



Abdomen subcylindrical, depressed, truncate at tip ; black scaled above, with 

 white basal bands occupying basal third or fourth of segments, with pale setae 

 on hind margins and a few along lateral margin; venter entirely yellowish- 

 white scaled. 



"Wings moderate, hyaline, with round brown stains faintly shown at base of 

 first marginal cell and bases of the two fork-cells ; veins black scaled, except the 

 cross- veins, which are naked; scales of two forms, long, narrow, appressed 

 spatulate scales subtruncate at tip and long narrow outstanding scales, absent 

 between cross-veins and bases of the two fork-ceUs, much heavier on basal halves 

 of forks of second and fourth veins, the basal portion of second vein to junction 

 with third vein, basal part of upper branch of fifth vein and outer two-thirds of 

 sixth vein forming patches which appear as black spots; basal cross-vein, 

 anterior cross- vein and stem of third vein nearly in line; first marginal cell 



