GEXUS TEXTHREDOPSIS. 103 



Synopsis of species. 



1 (27) Body for the greater part black. 



2 (5) Abdomen red at the apex. 



3 (4) Legs entirely red. Cordata. 



4 (3) Hind legs for the greater part black. Femoralis. 



5 (8) Abdomen entirely black. 



6 (7) Legs red. Microcephala. 



7 (6) Legs for greater part black. Caliginosa. 



8 (20) Abdomen red in the middle. 



9 (14) Pronotum and coxae entirely black. 



10 (11) Posterior femora black. Nigricollis. 



11 (10) Legs red. 



12 (13) Antennso short, hinder knees black, the red on abdomen not 



spotted with black. Ignobilis. 



13 (12) Antennae longish, the red on abdomen spotted with black, 



knees black. Nigronotaia. 



14 (9) Pronotum, coxae, and femora lined with white, the red on abdo- 



men marked with black in the middle. 



15 (16) Hinder femora black. Scutellaria. 



16 (15) Hinder femora red. 



17 (18) Clypeus deeply incised, tegulae white. Oraofa. 



18 (17) Clypeus not deeply incised, tegulae not white, the red on abdomen 



marked with black, a broad yellow line on basal segment, 

 tegulae black. Flavomaculata. 



19 (18) The red on abdomen not marked with black, tegulae fuscous. 



Picticeps. 



20 (8) Abdomen testaceous at the sides and beneath. 



21 (22) Head and thorax not testaceous, a yellow line at base of abdo- 



men, hinder femora black. Tristis. 



22 (21) Head more or less testaceous. 



23 (24) Thorax entirely black, hinder femora black. Fulviceps. 



24 (23) Thorax lined with white on pronotum or pleurae. 



25 (26) Vertex for greater part black, mesopleurae and sternum dashed 



with brown spots. Lividiventris. 



26 (25) Vertex for the greater part testaceous, mesopleurae with a large 



white mark. Albomaculata. 



27 (1) Body for the greater part luteous. 



28 (29) Head below the ocelli deep black, hinder femora for greater part 



black. Nigriceps. 



29 (28) Head below ocelli luteous. 



30 (31) Mesopleurae and sternum black, coxae and base of femora black. 



Saundersi. 



31 (30) Mesopleurae and sternum luteons. 



32 (33) Metapleurse black. Dorsivittata. 



33 (32) Metapleurae luteous. 



33 (36) Coxae and sutures of meso- and metapleurae marked with black. 



34 (35) Calcaria short, second recurrent nervure not interstitial. 



Inornata. 



35 (34) Calcaria long, second recurrent nervure interstitial. Nassata. 



36 (33) Coxae and sutures of pleurae marked with yellow and white. 



Sordida. 



