174 CHARLES ROBERTSON. 



2. Scutel with a median spine; angle of metathorax spinous germana. 



Scutel rounded or with a hlunt tubercle 3. 



3. Segments 2-4 without oblique basal fasciae 5. 



Segments 2-4 with oblique basal fasciae 4. 



4. Femora and tibiae and tarsi black ; ventral segment 6 narrow alternata. 



Femora and tibiae red, tarsi black ; ventral segment 6 broad texana. 



5. Segment 6 strongly abruptly narrowed, presenting a lateral angle; legs black, 



tarsi red rufltarsis. 



Segment 6 slightly sinuate laterally ; legs red ; small octodentata. 



Males. 



Cheek beneath broad, punctate, concave, posterior edge cariuate; segments 2-3 

 with basal interrupted pubeseut fasciae; 5 without lateral spines; 6 

 with two lateral and six short terminal spines, the median sulcus about 

 two-thirds the width of the segment; 7 visible as a pubescent spine; 

 ventral segments 4 5. 



Cheek with posterior inferior angle beveled or grooved ; segments 2 3 without 

 basal fasciae; 5 with lateral apical spines; 6 with two lateral and four 

 long terminal spines, the median sulcus about one-third the width of 

 the segment ; 7 retracted 1. 



1. Scutel with a median spine; ventral segments 5, 4 silicate, bidentate ; cheek 



with deep shining impunctate groove; face densely pubescent. 



germana. 

 Scutel rounded or with a slight median tubercle; ventral segments 4, 5 re- 

 tracted 2. 



2. Segment 1 with basal and apical fasciae, edge of concavity cariuate ; beveled 



space of cheek small, shining; apical spines closely approximated, the 

 interval with blackish hairs; middle of mandibles red ; ventral seg- 

 ment 4 emarginate modesta. 



Segment 1 with apical fasciae, edge of concavity hardly carinate 3. 



3. Bevel of cheek small, rather opaque and rough; disc of abdomen opaque, 



densely punctured ; transverse basal sulcus on segmeut 2 deep ; ven- 

 tral segment 4 bidentate ; legs black, tarsi red ; large rufltarsis. 



Bevel of cheek larger, shining, impunctate ; ventral segment 4 entire 4. 



4. Disc of abdomen shining, rather sparsely punctured, sulcus on segment 2 



rather shallow ; legs black, tibiae and tarsi more or less tinged with 



red sayi. 



Disc of abdomen opaque, densely punctured ; sulcus on segment 2 deep ; legs 

 red octodentata. 



5. Femora and tibiae aud tarsi black; punctures of abdomen finer, more close; 



ventral segment 4 bispinous alternata. 



Femora and tibiae largely red, tarsi black; punctures coarser, more sparse; 

 ventral segmeut 4 bidentate texana. 



