1961] 
Nutting and Gurney — Genus Vostox 
49 
and slightly longer than cheeks; antennae broken, one with 9, the other 
with 12 segments; abdomen notably wider, but with anal segment 
considerably narrower than the basal segment; marginal tubercles 
absent from terga four, five, and six ; forceps typically shorter, stouter, 
and shaped as in figure 1, with a large quadrate tooth on dorso-internal 
margin at base, both dorso- and ventro-internal margins prominent 
and irregularly but closely set with small tubercles, inner faces thus 
distinctly concave nearly to tips ; pygidium shaped as in figure 4. 
Coloration: Differs from male in no important respect except for 
being a shade darker over-all, especially on the anal segment and 
forceps. 
Measurements (in millimeters) : Body length (exclusive of for- 
and pvgidium.), 9; median length of head, 1.5; length of pronotum, 
1.5; median length of elytron, 2.5; internal length of exposed wing 
scale, 1.1 ; length of forceps, 4.3. 
Variation: There are five male paratypes, three of which do not 
vary significantly in size from the type; the length (in mm.) of 
various parts of the smallest specimen (Tucson) follow: body 7.2, 
head 1.5, pronotum 1.2, elytron 2.1, wing scale 1.1, forceps 2.8. The 
eyes of all but the smallest agree with the type in being shorter than 
the genae, whereas in the smallest spec men they are slightly longer. 
The complete number of antennal segments varies from 12 to 16. 
The Tucson specimen also lacks the marginal tubercles on terga four, 
five, and six. Although the forceps of all are distinctively excavated, 
the large tooth is absent in the two smaller specimens( Fig. 6), and 
its position marked only by a tubercle in the third. The shape of the 
pygidium apparently varies considerably as in brunneipennis ; in two 
specimens it is unlike the type in that it is truncated at the tip (Figs. 2 
and 3 ) . All genitalia are preserved in glycerol and show close agree- 
ment with those of the type in the shape of the parameres, details of 
the sclerotizcd armature of the basal vesicle, and the bend of the 
ejaculatory duct. 
The six female paratypes show considerably less variation in size 
and configuration of characters; the lengths (in mm.) of various 
parts of the smallest specimen (“Vcnodio”) follow: body 8.6, head 
1.6, pronotum 1.4, elytron 2.3, wing scale 1.2, forceps 2.2. The length 
of the eye of two agrees with the allotype in being longer than the 
cheeks, whereas in three it is shorter, and in the remaining specimen 
these measurements are equal. The number of antennal segments 
ranges from 13 to 16. Most of the paratypes vary but little in the 
shades of brown described above; however, the two females from 
