58 KANSAS ACADEMY OF SCIENCE. 
dz. Cheetotactic characters are useful undoubtedly, but when one asserts that 
they outweigh all others, of whatever kind or degree, I cannot follow him. 
Ectyphus Townsendi, n. sp. Female. Head black, clothed with white pile; 
the convex portion of the face, except its upper part, reddish yellow; orbits nar- 
rowly white pollinose, extending inwards on the upper part of the face. Antenne 
black, the lamella reddish yellow; lamella about three-fifths the length of the 
slender third joint, elongate oval in outline. Thorax black, slightly pruinose; 
humeral! and post-alar callosities reddish yellow; a spot on each side between the 
humeri and suture densely white, pollinose. Pleurz with similar spots on the 
upper part of the sterno- and mesopleurze. Abdomen deep, shining black; the 
posterior part of each segment, both above and below, rather broadly yellow; a 
small black spot on each side of the second segment in the yellow margin. The 
abdomen is rather broad, gently tapering, the last segment longer than the pre- 
ceding one. Legs yellow throughout, slender, the hind femora not thickened. 
(the distal part of the hind femora and the remainder of the hind legs are want- 
ing in the single specimen). Wings yellowish hyaline. Length, 17 mm. 
One specimen, Las Cruces, N. M. (Townsend). This species appears to be 
clearly congeneric with /. limbatus Willist., though the absence of the hind tibial 
spur cannot be affirmed. It differs from the above-cited species in the more 
elongate antennz, the less cylindrical shape of the abdomen, and in the color. 
The male of H#. limbatus is black, with the markings of the female, and it is 
probable that the male of this species will show a similar difference. 
CERIOMYDAS, gen, nov. 
Like Mydas, but the abdomen as in Ceria or Conops. The abdomen is 
pedunculate, much narrowed at the base, broadly expanded and acuminate dis- 
tally; the first two segments are tapering, the third cylindrical, with parallel 
sides, and nearly twice as long as wide; the fifth segment is as broad as the 
thorax, whence the abdomen tapers toa point. The face is more produced down- 
ward than in Mydas, and the labella are larger. There is a marginal cross-vein 
in the wings, and the hind tibiz are spurred. 
Crrtiomypas fraudulentus, n. sp. Female. Head black, the sides of the 
face below reddish. Front with soft white pile; face with two rows of soft, 
thick, reddish brown hair in the shape of a V, meeting at the oral margin. First 
three joints and the narrow portion of the lamella of the antennz deep brown, 
reddish along the under side, expanded portion of the lamella deep red; lamella 
altogether about three-fourths the length of the third joint. Mesonotum black, 
but little shining; humeral and post-alar callosities, the scutellum, and the pleurz 
for the most part, deep red. First three segments of the abdomen red, with a 
slender blackish hind margin; remainder black, but little shining. Legs red ; 
the upper part of the front and the hind femora, and a stripe along the front part 
of the latter, black or deep brown. Wings with the front part and the base deep 
brown, elsewhere hyaline; the limitation between the brown and the hyaline 
parts on the outer portion of the wings is not diffuse, the line running from a 
little before the middle of the wing antero-posteriorly straight to the tip of the 
wing; the first and second basal cells are brown throughout, extending diffusely 
into the discal and posterior cells; the anal angle is less deep brown, and has a 
large hyaline space along its middle; the alule are largely hyaline. Length, 
27 mm. 
One specimen, Chapada, Brazil (H.H.Smith). This species shows a remark- 
able mimicry of certain ones of Conops occurring in the same region. 
