83 



plate flat, apical width = 0.75 x basal width; base 



shallowly concave. 



Mesosternum basal width = 2 x mesocoxal line length; 

 coxal lines straight, parallel to anteriorly divergent; base 

 sinuate. Metasternum coxal lines meeting at middle in 

 straight line with a row of punctures, often weak (Fig. 

 15b) ; coxal line length variable, continuous around coxae or 

 reaching a maximum of 0.33 distance to posterior angle of 

 metasternum; line behind mesocoxa deep, groove-like; sternum 

 medial punctures fine, few coarse lateral punctures. 



First visible abdominal sternite with coxal lines 

 reaching 0.25 to 0.5 distance to posterior margin; rounded 

 between metacoxae. 



Male genitalia with median lobe weakly arched, narrowed 

 and apically rounded; internal sac without noticeable 

 sclerotized structures; flagellum long and narrow, straight 

 and apparently rigid at basal 0.5, length = 2 x median lobe 

 length (Fig. 79a); base of flagellum straight, sclerite at 

 base elongate claw-shaped (Fig. 79b-d) (9 northern Mexican, 

 1 Central American dissected) . 



Female genitalia with spermathecal head cone-shaped; 

 tail swollen and recurved onto itself at middle (Fig. 79e) 

 (6 northern Mexican dissected) . 



Stridulatory files present on occipital region of 

 males' heads; absent on females. Males with few or no 

 foveate punctures on prosternum in front of procoxae; 

 females with few to many punctures on prosternum in front of 



