320 
Psyche 
[December 
Material examined: Photograph of Holotype No. 1 88 1 (Ameri- 
can Museum of Natural History, New York), Oligocene of Floris- 
sant, Colorado. 
Fenusa parva (Brues), comb. nov. 
Figures 6 & y 
Lithoryssus parvus: Brues, 1906: 492, fig. 1; 1908: 272. 
Originally this was placed by Brues in the family Orussidae, but 
all features are typical of Tenthredinidae and indeed of the genus 
Fenusa Leach ( sensu Ross, 1951). The fossil differs from Nefusa 
Ross, which has a similar venation, by the nearly homonomous basal 
segments of the flagellum. 
Material examined: Specimens No. 2051-2052 and 2054 (Mu- 
seum of Comparative Zoology, Harvard University), determined 
as Lithoryssus parvus by Brues and noted by Brues (1908); 
Oligocene of Florissant, Colorado. 
Florissantinus angulatus gen. nov., sp. nov. 
Figure 8 
C moderately swollen before pterostigma. SC in form of a cross- 
vein before the junction of R and M. R + M long (half the length 
of the cell imcu). Cell 2r + 3r narrow, without cross-vein 2r-rs. 
RS between cells ir and 2rm developed. Cross-veins 2r-m and 3r-m 
are not preserved; im-cu converged with first absciss of M to the 
front margin of the wing. 2m-cu sharply bent inward of cell 2mcu, 
probably not reaching M. Cross-vein cu-a a little distal of the middle 
of cell imcu. Ai and A2 fused for a little distance, both anal cells 
closed. In hind wings cells r, mcu and cua closed, rm perhaps 
opened. Cross-vein m-cu oblique. Ovipositor as long as mesonotum, 
ovipositor sheath seeming to form 5-angled-area, narrowed toward 
the end. Length of the body, 4.5mm; of the forewing, 4.3mm. 
The completely reduced 2r-rs, converged M and im-cu, the ob- 
lique 2m-cu, which may reach M only basally of 2r-m, and the form 
of the anals indicate that this insect belongs to the tribe Nematini 
s. str. and that it is similar to Hemichroa Stephens, Platycampus 
Schiodte and Jnoplonyx Marlatt. However, the straight M, not 
bent at the junctions of 2r-m and 2m-cu, and the short distance 
between the anal cells separate it from these genera, a very oblique 
2m-cu apparently from all the Tenthredinidae. 
Material studied: Holotype No. 2053 (Museum of Comparative 
Zoology, Harvard University), Oligocene of Florissant, Colorado. 
