1945] TropiduchidcB and Kinnaridx 121 
sural margin, area of membrane much less than that of corium 
(by approximately a third). 
Genotype, Achilius bicinctus Spinola 1839, Ann. Soc. Ent. 
France, 8:321. 
A. bicincta Spinola 
Female. Length, 5.0 mm.; tegmen, 6.0 mm. 
Pallid stramineous, possibly green in life, carinae of head and 
thorax, a stripe at sides of abdomen and a suffusion on post- 
femora red, sometimes concolorous, the carinae probably also 
piceous in some specimens; a spot on ventrolateral margin of 
pronotum on each side, a spot on pleurite immediately beneath 
the base of each tegmen piceous. 
Tegmina ivory hyaline, a fuscous band from costa to anal 
angle just distad of basal cell, a fuscous band lying along nodal 
line on its distal side, and accordingly arcuately curved basad, 
veins of apical line of cross veins narrowly fuscous, a broad 
slightly paler fuscous border along apical margin, becoming 
paler at Cu and evanescent before apex of clavus; veins testa- 
ceous. Wings with apical lobe faintly suffused fuscous, R-M 
and M-Cu cross veins dark fuscous, veins otherwise testaceous, 
slightly tinged fuscous at apical margin. 
Ovipositor with third valvulae each bearing eight spines on 
margin. 
Described from two females collected at Tonala, Chiapas, 
Mexico (July 31, 1909) in the collection of the A. M. N. H. 
They agree with Spinola’s description and differ from his figures 
only in the slightly longer sunken disc of the vertex, the forking 
of Cul before the nodal line and in having one or two more 
apical veins. The shape of the tegmina is identical. Though 
this species should fall into the Tambiniinoe on the position of 
the nodal line, it undoubtedly belongs to the group of Neo- 
tropical Paricanine forms. Achilorma fowleriana Kirk, is not 
congeneric with bicinta. 
Arenasella Schmidt 
(figs. 17-19) 
Vertex as long as broad, anterior margin strongly convex, 
lateral margins parallel, posterior margin deeply concave; most 
of disc of vertex much depressed, anterior margin of sunken 
area strongly convex almost subangularly so, reaching beyond 
