— 5— 



SOHKAMIl.V IV. ISSINiE. 



TABLE OF GENERA. 

 Wings much shortened, not reaching the tip of abdomen, or rudimentary ; the 



head prod need 4- 



Wings not unusually shortened, complete. 



Head produced 3. 



Head truncated, before the eyes not or scarcely prominent ; wings strongly de- 

 cmubent. 



Posterior \.\\nx with three spines 2. 



Posterior tibiie wiih two spines. 



Costa bffore the middle or anteriorly beneath, very distinctly dilated ; 

 interior ulnar vein simple, exterior ulnar vein and the radial vein near 

 the base, torked ; verte.x smooth. . . G. i. Hysteropterum, A. et S. 

 Costa simple beneath towards the base, excepting a very obsolete dilation ; 

 wings behind the apex of the clavus oblique, very obtusely rounded, the 

 interior ulnar vein nearly simple ; first joint of posterior tarsi short . . . 



G. 2. Falcidius, Sliil. 

 Thorax at base slightly and broadly sinuated. 



Wings vitieous, regularly reticulated, obtusely rounded at apex ; costa 

 dilated, membiane of costa with transverse veins, ulnar vein in the 



middle of wing, forked G. 3. Neaethus, Stal. 



Wings at apex very slightly deeply angulately emarginated or incised, and 

 riUtly with transverse veins, not reticulated ; the vein of the anal area 



forked : anterior femora simple, sul)Compressed 



G. 4. Thionia, S'al. 



Wings at apex entiie ; frons and clypeus lying nearly in the same plane, the 



frons somewhat reclining and slightly rtflexed G. 5. Issus, Fabr. 



2 Vertex very short, sublunate, anterior margin strongly carinated ; frons rounded, 



prominent, the cential plate almost circular, flattened and very much raised" 

 above the surrounding area, exterior margins strongly carinate, curving con- 

 foi-mable with the central plate. Pronotum longer than the vertex, lunate, 

 bluntly curved on anterior margin, po>terior margin deeply sinuated. Hem- 

 elytra long and narrow, a little obliquely rounded at tip, costal and sutural 



mar!.;ins nearly straight G. 6. Aphelonema, Uhler. 



Vertex suliquadrate, deeply scooped out, anterior angles rectan_^ular with bound- 

 ing keels high, anterior mari^in arched in the centre ; frons longer than wide, 

 sides convexly curved, middle keel extends 2 1/3 its leiiL;th downwards. Pron- 

 otum acutely triangiila'-, exiending forward almost to front line of eyes, deeply 

 emarginaied behind. Hemelyira long and narrow, vitieous, hispid, regularly 

 parabolic on the costal margin, from the base to the inner apical angle, the 

 inner margin straight ; field with a net work of large rounded aieoles; costal 

 area obliterated ... ... G. 7. Dictyonissus, Uhler. 



Abdomen distinctly compressed ; costa remote from the margin ; anterior tibiai 

 longer thin the fenioi a and trochanters togeiher . G. 8. Tylana, Stal. 



3 Costa occupying the same margin, beneath anteri(jrly or before the middle, dilated; 



po t -rior tibin? wi h one >pine ... G. 9. Mycterodus, Spinola. 



4 Wings tailed, apical angle of tli'- commissural produced, slightly curving upwards; 



clavus not attaining the apex of the wing. Costa dilated, remote from the 

 margin, dilated part with transverse veins, not inflexed ; po-terior tibiae with 

 two spines G. 10. Conosimus, Mulsant. 



