1936] N eotropical Stratiomyidse 
49 
A 
NEW AND LITTLE-KHOWN NEOTROPICAL STRA- 
TIOMYID^S (DIPTERA) IN THE MUSEUM OF 
COMPARATIVE ZOOLOGY 
By Maurice T. James 
Colorado State College 
A small collection of Neotropical Stratiomyidse, kindly 
sent to me by Dr. Nathan Banks, contained a number of 
interesting species, several of which are here described as 
new. All types are being returned to the Museum of Com- 
parative Zoology, Cambridge, Mass. 
Monacanthella, new genus 
This genus is proposed for the reception of a remarkable 
species which may readily be distinguished from other 
described Clitellariinse by the peculiar structure of the scu- 
tellum; instead of being unspined or with paired spines, as 
in other members of this sub-family, the scutellum termi- 
nates in a single, median, conical spine, which is elevated at 
a slight angle to the rest of the scutellum. The exact rela- 
tionship of this genus is hard to determine; in its slender 
form and general type of wing venation, it suggests Merin- 
gostylus, though the antennse are quite different. 
Diagnosis. Female.. Eyes dichoptic, separated by two 
and one-half times the width of the ocellar triangle, bare ; 
front of equal width; the face broadening out toward the 
oral margin. Ocellar triangle somewhat longer than wide, 
removed some distance from the occiput. Antennse situated 
somewhat below the middle of the head in lateral profile, but 
remote from the oral margin ; ten-segmented, the first three 
subequal, the subsequent ones gradually decreasing in 
length ; segments one and two distinct, each with a number 
of apical hairs on each side ; segments three to seven inclu- 
sively distinctly separated, each segment with a subbasal 
hair on each side, and bearing sensory pits ; segments eight 
