494 
Journal of Agricultural Research 
Vol. XXXI, No. 5 
This insect should be added to the group of species including 
maritimus (Ehrhorn), adonidum (Linnaeus) and comstocki (Kuwana). 
It resembles the last more closely than any other mealybug that the 
writer is familiar with, having the general organization of the pores 
and ducts and the posterior cerarii almost identical, but differing in 
apparently lacking a ventral chitinized thickening, and, on the head, 
in having the dorsal body setae shorter and more conspicuously 
Fig. 5.— Trionymus danthoniae, adult female: A, apex of abdomen, X 96; B, antenna, X 96; C, posterior 
leg, X 96; D, outline of body, optical section, X 10; E, apex of head, X 96 
contrasted with the ventral in size, and finally in having fewer 
multilocular disk pores and ventral tubular ducts than are present in 
comstocki. 
Genus TRIONYMUS Berg 
Trionymus danthoniae, new species (fig. 5) 
Adult female. —(See Maskell paper (10, p. 188-189) for all available in¬ 
formation regarding external appearance; described here from slide mount only.) 
Length 5.75 mm., width 2.5 mm., nearly parallel-sided with ends of body rounded, 
segmental constrictions more or less evident; antennae normally 8-segmented, 
average length of the segments in microns about as follows: I, 80; II, 89; III, 52; 
