38 CATALOGUE OF 
§§ Head beneath red or yellowish, or at least with 
the bucculi wholly pale. 
x Prothorax in front depressed, or slightly concave ; 
sides slightly rounded in the middle. - MicrospiLus 
XX Prothorax not depressed in front; sides almost 
wholly straight, or a little rounded near the 
hind border. 
o Scutellum rather convex hindward; a slight longi- 
tudinal keel only close to the tip. —- - MELANORYTHEUS 
oo Scutellum with a distinct obtuse keel, extending 
from the tip to the middle or beyond the 
latter. - - - - - LyGzus. 
De Mayr has divided Lygzus into the following sections :— 
1. Rostrum extending to the hind border of the third ventral segment, 
Prothorax not emarginate behind. Scutellum even. Femora un- 
armed. 1. leucurus, abr. 
2. Rostrum extending to the second ventral segment. Prothorax impressed 
near the fore berder, without any transverse middle impression; sides 
prominent; hind border more or less emarginate. Scutellum with 
elevated sides. Femora unarmed. 1. fasciatus, Dall. 2. aulicus, 
Fabr. 3. varicolor, Fabr. 4. unifasciatus, Hahn, 5. castaneipes, 
Dall, 6. Amboinensis, Mayr. 
3. Rostrnin extending to the hind border of the pectus. Prothorax as in 
Sect. 2, hardly emarginate behind. Scutellum nearly even, with a 
middle keel. Femora unarmed. 1. familiaris, /abr. 
4, Rostrum extending to the fore border of the second ventral segment. 
Prothorax somewhat even; hind border straight. Scutellum even, 
with a middle keel. Femora unarmed. 1. .apicalis, Dall. 2. elatus, 
Stal. 3. pulchellus, faér. 4. pallidocinctus, Scal. 5. xanthostaurus, 
H.-Sch. 6. Poeyi, Guér. 
5. Rostrum extending to the middle coxe or to the hind cox. Prothorax 
almost even; sides not or but little prominent. Scutellum even, 
keeled, with two transverse impressions. Femora unarmed. 1. apuans, 
Rossi. 2. equestris, Zinn. 3. tineicus, Fubr. 4. albostillatus, Stal, 
5. maculicollis, Germ. 6. servus, Fabr. 
. Rostrum extending to the base of the abdomen. Prothorax with a 
transverse ridge in front, with_a longitudinal keel hindward; sides 
and hind border straight. Scutellum deeply keeled. Femora 
unarmed. 1. fulvipes, Dadd. 
7. Rostrum extending to the middle of the hind pectus. Prothorax with a 
transverse impression in the middle or a little before the middle, and 
with a slight transverse ridge in front; sides prominent. Scutellum 
even, keeled, with two impressions. Feimora of the male denticulated. 
excepting those of L. pacificus. 1. militaris, Fabr. 2. crudelis, abr. 
3. saxatilis, Scop. 4. hospes, abr. 5. pacificus, Boisd. 6. mundus, 
Dall. 7. Fairmairei, Sgnt. 
8. Rostrum extending to the middle of the hind pectus. Head distinctly 
tumid near the antenniferous tubercles. Prothorax almost even, with 
a slight keel more slanting in front. Scutellum even, keeled. Femora 
unidenticulate, or with a few minute teeth. 1. longulus, Dall. 
jor) 
