FORMOSAN AGROMYZIDAE. 
883 
Crypto chætum grandicorne Bond ani. 
Bull. Soc. Ént. Ital., 1875, p. 172. 
A single example of this species, Polisha, December. 
PHYTOMYZINAE. 
Napomyza atrata n. sp. 
Female: Glossy black. Frons opaque, frontal triangle and orbits glossy 
black ; antennae, palpi, and proboscis black, the apex of the latter brownish. 
Legs brownish-black, shining, tarsi yellowish. Wings slightly brownish, 
veins deep brown, fourth vein from the cross vein to its apex indistinct. 
Squamæ grayish, fringes brown. Halteres whitish yellow. 
Frons distinctly less than one-third the width of head, orbits narrow, 
each about one-fourth as wide as center stripe, well differentiated ; 4 pairs 
of orbitals present, the upper pair very strong, the others decreasing ra¬ 
pidly in size anteriorly, the front pair being reduced to mere hairs, orbits 
otherwise bare; triangle small, reaching very little beyond the anterior 
ocellus, but well defined; antennæ small, third joint rounded; arista al¬ 
most bare, slender, its length equal to that of frons ; cheek linear, slightly 
broadened posteriorly, marginal hairs weak, vibrissa slightly differentiated. 
Mesonotum with 2 pairs of strong dorso-centrals, and generally a weak, 
anterior pair; discal setulæ numerous, about ten rows between the dorso- 
centrals. Abdomen ovate, surface with short hairs ; ovipositor short, slightly 
spatulate at apex, very similar in shape to that of Agromyza parvicornis 
Loew. Legs of moderate strength; mid. tibiae with 2 very weak posterior 
setulæ, as in most species of Agromyza. Wing venation as fig 10. 
Length : 3 mm. 
Type: Kosempo, November. 
Male: Similar in coloration to the female, except that the tarsi are 
paler, and the wings are almost clear. In both the males before me the 
size is about P75 mm, and there is a yellow central organ to the hypopy- 
gium, which is very distinctly protruded. In one example the venation 
is similar to that of the female, while in the other the large cross vein is 
distinctly in front of the small one. 
Allotype: Takao, October 24, 1907. 
Paratype: Tainan, May, 1912. 
This species has much the habitus of some of the species in the genus 
Agromyza, especially of the parvicornis group, and is very different from the 
type species of Napomyza, which is slender in build, and resembles thus the 
