SUBFAMILY III. — ORTHOTYLIN^E. 835 



and a key leading up to their names very difficult to form. 

 Knight did not attempt one even for the 12 species he included 

 in the Hemiptera of Connecticut. The following will perhaps 

 enable the student to correctly identify the majority of our 

 eastern species : 86 



KEY TO EASTERN SPECIES OF LOPIDEA. 



a. Joints 1 and 2 of antennae very stout, joint 1 subclavate, 2 distinctly 



thicker just behind middle than at apex. (Subgenus Lomatopleura) . 



b. Femora black or brown; head in part black; length, 7 or more mm. 



c. Calli red ; scutellum not or but slightly tinged with fuscous. 



896. C.-ESAR. 



cc. Calli fuscous; scutellum strongly tinged with fuscous; host plant 



witch-hazel, Hamamelis virginiana L. 898. reuteri. 



bb. Femora red ; head mostly pale, sometimes tinged with fuscous, the 



base and rarely the front of vertex black or fuscous ; length not 



more than 6.5 mm. 



d. Embolium and pronotum wholly red; head wholly pale; calli red. 



899. instabile. 

 dd. Embolium and usually the basal angles of pronotum straw-yellow; 

 front of head usually blackish; calli fuscous. 



900. MARGINALIS. 



act. Joints 1 and 2 of antenna? slender, joint 1 cylindrical, 2 not distinctly 

 thicker just behind middle than at apex. (Subgenus Lopidea). 

 e. Larger, length 6 or more mm. 

 /. Pronotum without a distinct blackish cross-bar on apical half; 

 coxae and trochanters in great part or wholly pale ; head usually 

 with two fuscous stripes which are more or less confluent behind. 

 g. Joint 1 of antennae shorter than width of vertex; color orange- 

 or brick-red ; scutellum and inner apical halves of clavus and 

 corium at most but slightly tinged with fuscous ; host plant, 

 leaf-cup, Polymnia uvedalia L. 901. confluens. 



gg. Joint 1 of antennae as long as or slightly longer than width of 

 vertex. 

 h. Scutellum, clavus and corium heavily tinged with black or fus- 

 cous. 

 i. General color deep red ; middle of basal half of pronotum 

 heavily tinged with fuscous; length, 6 — 6.2 mm.; host plant, 

 the veiny pea or vetchling, Lathyrus venosus Muhl. 



902. LATHYRvE. 



ii. General color orange- or dull clay-yellow; basal half of prono- 

 tum not or lightly tinged with fuscous; length, 6.5 — 6.8 mm.; 

 host plant, black locust, Robinia pseudocacia L. 



903. robinia. 

 hh. Scutellum, clavus and corium not at all or but lightly tinged 

 with fuscous; length, 6.5 — 7 mm.; host plant, American 

 bladdernut, Staphylea tri folia L. 



seThree species, L. hesperia (Kirk.), saiji Knight and floridana (Walker) are 

 not included in the key. as no examples of them have been seen, and the original 

 descriptions, copied farther on in the text, contain no definite characters of suf- 

 ficient importance to readily separate them from their allies. 



