42 
Psyche 
[June 
Macquart, which was from India, and which I have not 
seen. I therefore leave the New World species provision- 
ally in Senoprosopis; all of these New World species 
have a distinct, rather long petiole at the base of the 
fourth posterior cell, in contrast to the two Florissant 
species and for this reason I propose the subgeneric name 
Eo senoprosopis for these two species with S. romeri as 
type of subgenus. As far as the second submarginal cell 
is concerned, the two fossil species agree better with 
Opopotes Hull, a Recent Costa Rican species, in which 
the anterior branch of the third vein ends clearly at the 
apex, and not a short distance above the apex as in the 
South American species of Senoprosopis. Opopotes is 
further characterized by the remarkably attenuate third 
antennal segment, 2 segmented, rather short styles; this 
may be the genus represented by the figure labelled Seno- 
prosopis sp., in Curran’s The Families and Genera of 
North American Diptera, 1934. 
These two Florissant species give a very nice indication 
of the slight degree of change, at least as far as the wing 
is concerned, between Miocene and Recent species. 
Pseudosphegina carpenteri, new species 
Plates 3 2 and 4 
Length 5.6 mm. 
Male. Head : Eyes almost touching above the front, 
the ocelli form an isosceles triangle. Face with a well 
developed tubercle situated a little below the middle of 
the face. Antenna set a little above the middle of the 
head in profile, the first 2 segments quite short, each with 
2 For a colored photograph of this specimen, see cover of Scientific 
American, November, 1951. 
Explanation of Plate 4 
Pseudosphegina carpenteri n. sp. (Holotype, Baltic amber, no. 5124, 
Museum of Comparative Zoology). A. wing. B. Proximal segments of 
metathoracic leg. C. Distal segments of metathoracic leg. D. Posterior 
part of abdomen : t3, t4, 3rd and 4th tergites ; st3, st4, 3rd and 4th 
sternites. 
