218 
8. Mesosternum with a large black patch on each side of central ridge; head 
as in Figure 69, Plate XX; pronotum sharply carinate on lateral margins 
from posterior to near anterior margin (Tex., Cal.)........... brevis V. D. 
9. Mesosternum without a black patch on each side of central ridge; head with 
sides straight for a considerable distance; pronotum with lateral margins 
sharply carinate only on posterior half or less (Tex.)...antiguensis West. 
THYANTA ELEGANS, Sp. 0. 
Male and Female—Pale green, marked with yellowish white. Head 
with a broad white stripe on each side of dorsum, the two covering the 
juga almost to apex, and a white stripe below each eye on venter. Pro- 
notum with a narrow white line on each lateral margin, and a reddish 
transverse band between humeri in male, the transverse band conspicu- 
ously white in center in female; prosternum, mesosternum, and meta- 
sternum each with a white spot or stripe on each side; scutellum broadly 
white on each lateral margin and in center, the scutellar stripes margined 
internally with red; elytra with a rather broad white costal streak. Con- 
nexivum uniform green; venter whitish green, the punctures darker. 
Legs green; tarsal claws blackened on apical half. 
Head convex above, very distinctly longer than broad; dorsal vein 
as in Figure 71; second antennal joint longer than third. Humeral margin 
angulated but not very sharp; pronotum. with a very conspicuous broad 
transverse depression in center, the dorsum coarsely punctate except on 
the transverse pale line in female. Scutellum rather narrowly rounded at 
apex, coarsely punctate except on margins at base and apex. Elytra 
coarsely punctate, not appreciably rounded off basad at apex on outer side. 
Genital plates of femaleas in Figure 76 ; hypopygium of male as in Figure 
77. Hairs on tibia long, many of them longer than diameter of tibia. 
Length: male, 6 mm.; female, 7 mm. 
Type, male, Loma, Texas, July 7, 1908. Allotype, Lake Lomalta, 
Tex., November 27, 1910. 
This species is distinguished from every other in the genus by its 
striking green and white markings and much elongated head. The head 
of T. brevis, which is much broader, is shown in Figure 69. 
ADDENDUM 2 
Key to Apateticus and Allies 
1. Tibia without a dorsal canal or groove; pronotum with large sharp spines 
on posterior lateral angle and a small thorn on posterior margin on each 
side of base of scutellum; osteole short, not curved; scutellum with a 
tumid area on each side at base (TeX.)..............0008- Tylospilus Stal. 
— Tibia with a dorsal canal or groove bounded on each side by a slight but 
distinct ridge; scutellum punctate at base.......... cc cece cee eee ee ee eee 2 
2. Pronotum with an acute spine on posterior margin at each side of base of 
Rll hvelibh tae OP ODOT Goninon ON TEAS cee canes oe ne Apateticus Dall. 
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