1977] 
Porter — Mesostenines 
37 
PHAENOLOGY: Flies from December to May with peak between 
December and April (13 females in December, 6 males in January, 
2 females and 4 males in March, 5 females and 1 male in April, and 
1 male in May). 
Varies in abundance from year to year: 3 specimens in ’73-’74, 
25 in ’74-75, none in ’75-76, and 4 so far in ’76-77. 
Genus Cryptanura 
The Valley has three Cryptanura, of which one is new and one 
is here recorded for the first time from the United States. 
Key to the U. S. Cryptanura 
(Females only) 
1. Second gastric tergite mostly mat; clypeus more or less strongly 
convex in profile; humeral margin of pronotum not conically 
produced anteriorly, but often with a carinate elevation above 
end of epomia; sublateral white stripe of propodeum strongly 
narrowed basad of crista 2 
Second tergite polished; clypeus nasute; humeral margin of pro- 
notum anteriorly with a prominent subconical to conical ex- 
pansion; sublateral white stripe of propodeum not narrowed 
basad of crista 4 
2. Epomia not reaching humeral margin of pronotum, the humeral 
margin not carinate or tuberculate anteriorly; second gastric 
tergite with a medio-basal white spot 
C. septentrionalis Cushman 
Epomia forms a carinate elevation on humeral margin of pro- 
notum anteriorly; second tergite at most narrowly tinged with 
whitish medio-basally 3 
3. Hind coxa white with conspicuous black markings; femora yel- 
lowish white with a broad, percurrent dorsal black band; 
lower metapleuron with coarse oblique wrinkling that be- 
comes irregular only on about dorsal 1/4 and with at most 
obscure intercalated punctures; propodeal dorsum behind 
basal trans-carina coarsely and irregularly wrinkled and 
puncto-reticulate but without discrete punctures 
11. C. lament aria (Cameron). 
