1965] 
Bush — Zonosemata 
31 
GENERIC DESCRIPTION. Head (Fig. 30) : subquadrate in profile; 
about 1. 1 times wider than high; all regions, including palps and 
mentum, light yellow to yellowish-orange; ocellar triangle light 
brown to brownish-black; vertex measured across anterior margin 
of ocellar plate, narrower than maximum width of eye; eye about 
1.5 times higher than wide; frons convex in profile, prominent at 
antennae, slightly wider at vertex than at antennae ; antennae .5 - .6 
length of face; third segment with sharp awl-shaped tip, more than 
twice length of second ; artista black or dark brown, pubescent, 
grading to yellow at base; face minutely pubescent. Genae moderately 
narrow, .23-.26 height of head. Postcranial region and head slightly 
concave; foveae and carina moderately developed; epistome slightly 
upturned ; postgenae bulging. Usually four pairs convergent black 
fronto-orbitals, occasionally only three pairs or with one or two extra 
bristles on one side or both; two pairs black reclinate divergent 
upper fronto-orbitals, upper approximately two-thirds length of 
lower; ocellars strongly proclinate, divergent, approximately same 
length as upper fronto-orbitals. Comb translucent yellow. Outer 
verticals black, about two-thirds length black inner verticals; post- 
orbitals yellow, short; genal bristles variable, yellow or black when 
present, occasionally undifferentiated; yellow gular bristle weak or 
undifferentiated. Thorax: entirely yellow or with brown and black 
maculations; halteres yellow. Dorsum and scutellum covered with 
short decumbent yellow or black setae, lacking any trace of pollinose 
microtrichia. Normally one pair outer scutellars, rarely one or two 
minute scapulars present; dorsocentrals in line or slightly before line 
drawn between posterior supraalars; two mesopleurals ; all other 
bristles normal for Trypetinae. Legs: all segments yellow except 
for black shading along posterior surface of metathoracic tibia. 
Prothoracic femur with one posterior-ventral and two dorsal rows 
of stout bristles. Mesothoracic tibia with row of three to five short 
semierect bristles on posterior surface. Metathoracic tibia with row 
of short semierect bristles along posterior-lateral surface. Wing: 
pattern consisting of transverse brown crossbands; R x setulose over 
entire length including node; R4+5 setulose; usually one to three 
setae dorsally at junction of R4+5 and R2 + 3 ; anal cell drawn out 
to point along Cu2 + 2nd A. Abdomen: tergites covered with fine 
long decumbent setae ; long black bristles along posterior and lateral 
margins of tergites III-V in male and II I- VI in female (Fig. 24) 
with well developed internal apodemes. Sternite VI about .55 length 
of ovipositor sheath. Sternites of male (Fig. 23) without well 
developed internal apodemes. Genitalia: male epandrium globose, 
