6 Mr. T. D. A. Cockerell on Fossil Arthropods 
H. 1520. This may be a Cryptine ; thus Holocryptus has 
a similar areolet, but the b.n. is straight, except for a bend 
at the lower end. Pycnocryptus exactly agrees in the areolet, 
and the hind wing agrees, but the b. n. is straight. 
Coleocentrus gurnetensis, sp.n. (Fig. 3.) 
Thorax black. Anterior wing about 10°5 mm., marginal 
cell 4 mm. long; wing hyaline, with broad pale ferruginous 
clouds along veins and in apical part of marginal cell (as 
preserved) ; stigma and nervures piceous ; areolet very 
small, triangular, petiolate above ; stigma long and narrow ; 
b. n. straight, going basad of the oblique t.-m. 
Fig. 3. 
Coleocentrus gurnetensis, sp. N. 
B.M., In. 17079 (A’C. Sm.). The venation agrees very 
well with that of the much larger C. ercitator, Poda; the 
size of the fossil nearly agrees with C. caligatus, Grav. At 
first I thought this might be a Campoplex, but the marginal 
cell and small areolet agree better with Coleocentrus. There 
is some resemblance to Lhyssa, but that has r.2 con- 
spicuously arched. 
Lithapechtis (gen. nov.) fumosus, sp.n. (Fig. 4.) 
Anterior wing slightly over 6°5 mm. long, fuliginous, with 
fuscous nervures and ferruginous stigma. Stigma well 
developed ; marginal cell deep, trigonal, the lower sides 
straight, with a strong angle at t.-c.; areolet oblique, elon- 
gate, the apical side smallest; b.n. arched, going basad of 
t.-m.; disc. 3 with upper and lower sides practically parallel 
except basally. 
H. 506, collected in 1891. Apechtis (e. g., A. conquisitor, 
