490 
ZOOLOGICAL LITERATURE. 
/3. Thorax about twice as broad in the middle as at apex ; 
ocelli closely approximated to the eyes. 
21. Tropidaspis, g. n. 
{Centr. carinatus, Fab.) 
t Basal margin of head neither keeled nor corniculate. 
a. Head truncate, perpendicular at base. 
22. SCYTODEPSA, g. n. 
(Centt\ exiyuus, Fab.) 
b. Head triangularly produced, sulcate above. 
23. Stictodepsa, g. n. 
( Cic. fuscata, Fab.) 
Stal (GEfvers. Kongl.Vet.-Akad.Forh. xxvi. pp. 280-283) gives 
the following table of the genera of Old-World Centrotida : — 
I. Lateribus prostethii et mesostethii lobulo vel dente deorsum vergente 
armatis. 
A. Scutello nullo. 
1. Alls areis apicalibus 3 instructis . . . . 1. Oxyrhachis (Germ.). 
2, Alis areis apicalibus 4 instructis. ... 2. Xiphistes (StSl). 
B. Scutello completo. 
1. Capite thoraceque denticulatis, thorace anterius utrimque supra an- 
gulos laterales cornuto 3. Oentrocuares (StSl). 
2. Thorace dorso anterius processu sursum vergente armato, cornibus 
lateralibus destitute 4. IIypsauchenia (Germ.). 
II. Lateribus pectoris inermibus ; tibiis rarissime dilatatis. 
A. Thorace postice processu instructo. 
1. Alis areis apicalibus 4 instructis. 
a. Scutello longiore quam latiore, sensim acuminato vel apicem versus 
valde angustato 6. Leptodelus (StSl). 
b. Scutello transverse, vel fere aeque longo ac lato, apice lato. 
* Scutello processu gi-acili postico thoracis saltern duplo latiore. 
a. Thorace modice couvexo, supra angulos laterales cornu vel 
tuberculo destitute 6. Uroxiphus (A. & S.). 
)3. Thorace supra angulos laterales cornuto vel tuberculato. 
a. Processu postico thoracis a scutello valde distante, valde 
curvato vel prope basin geniculate, compresso. 
7. XiPHOPCEUS (StSl). 
b. Processu postico thoracis a scutello interdum distante, tunc 
maximam ad partem recto, basin versus leviter curvato, 
gracili, baud compresso. 
** Thorace supra angulos laterales obtuse tuberculato. 
8. Acanthophyes (Stil). 
tt Thorace supra angulos laterales cornuto. 
aa. Thoracis processu postico scutellum tangente. 
9. Centruchus (Stal). 
/3/3. Thoracis processu postico a scutello valde distante. 
10. LePTO CENTRES (StSl). 
t Scutello basi processus postici thoracis baud vel paullo, rare vix 
duplo latiore. 
a. Fronte basi utrimque lobo destituta j processu postico thoracis 
