SMICRONYX WEEVILS—ANDERSON 323 
figs. 9, 10, 28, 29). Antennae inserted behind the middle of the 
rostrum in the female (fig. 29), slightly before the middle in the 
male (fig. 28). Second segment of the antennal funicle longer than 
the third segment (fig. 34). External lobes of the mandibles fairly 
well developed (fig. 47). Prosternum emarginate at the anterior 
edge but not concave and not bordered by antecoxal ridges (fig. 37). 
Humeri distinct to prominent, the scutellum distinct (fig. 8). Tarsal] 
claws larger, less connate and more divergent than in the subgenus 
Smicronyx (figs. 39, 42). Median lobe of the male genitalia more 
elongate (except in scapalis LeConte, fig. 93) than in the subgenera 
Smicronyz and Pachyphanes, lightly sclerotized dorsally and ventrally, 
the sides subparallel (figs. 93-101). Female genitalia with the 
spiculum ventrale elongated as in the subgenus Pseudosmicronyx 
(figs. 139-147), but the arms not forming a distinct V except in a few 
species of the fulvus group (fig. 145). 
Host puants: Most of the known host plants of species in this 
subgenus belong to the family Compositae. 
Distrisution: The species placed in this subgenus are known 
only from North America. 
Key to the Species Groups of Subgenus Desmoris 
1. Rostra of both sexes laterally expanded at apex, not very smooth or shining 
before antennal insertions in females. . . ... . seapalis group (p. 323) 
Rostrum not expanded at apex in either sex, always smooth and shining before 
ancennal msertionsuim females, 3 605% .< 5 + 8 mw Ses «halos ee 2 
2. Rostra of both sexes almost straight (figs. 9,10); emargination of prosternum 
POUM AGC Orem San eanetan i ee, Ge Sen ec ye Sets: cee Oe fulvus group (p. 332) 
Rostra of females distinctly curved (fig. 29); emargination of prosternum 
Subgquadrate: fe ee eo as ne ee ee be constrictus group (p. 326) 
SMICRONYX SCAPALIS GROUP 
Description: Very large, usually over 4.0 mm. in length. Rostra 
of both sexes laterally expanded at apex, punctate and subcarinate 
from base to apex. Rostrum of the male not much shorter than that 
of the female, but slightly curved instead of straight, as in the female. 
Second joint of antennal funicle subequal to first and much longer 
than third joint. Body and legs covered with nearly unicolorous 
scales. Elytra strongly convex above, humeri distinct, declivities 
indistinct. Median lobe of the male genitalia not as elongate as in 
the other two groups of species of subgenus Demoris (compare figs. 
93, 94-101). 
® The degree of separation of the ventral margins of the eyes, originally used by Dietz (1894) in distin- 
guishing Smicronyx and Pseudosmicronyx from Desmoris, has not been found consistent enough to be useful 
as a subgeneric character. 
