20 U.S. NATIONAL MUSEUM BULLETIN 27 9 



Dorsal lobe 1 (DLl) of abdominal segments 1 to 4 with single 

 transverse row of about 10 to 14 spinules (fig. 36). Median 

 epicranial setae very small or absent 3 



3. Median group of phobae on pedium usually restricted to right 



side (fig. 6). Frons broadly rounded posteriorly and very promi- 



nendy pitted (fig. 54) aequalis 



Median group of phobae on pedium not restricted to right side 

 (figs. 3 and 8). Frons more abruptly narrowed posteriorly and 

 less prominently pitted (figs. 55 and 58) . . scaber and fascifer 



4. Dorsal lobe 1 (DLl) of abdominal segments 1 to 4 with single 



transverse row of about 12 to 20 spinules (fig. 36) 5 



Dorsal lobe 1 (DLl) of abdominal segments 1 to 4 with transverse, 

 irregular double row or transverse band of about 20 to 50 spinules 

 (fig. 37) • • • ^ 



5. Head capsule width usually greater than 1.90 mxn. With 1 long 



sensory seta and 5 sensory pegs at distal end of segment 3 of 



antenna (figs. 45 and 46) variolatus 



Head capsule width less than 1 .90 mm. With 6 sensory pegs at end 

 of segment 3 of antenna, lack long sensory seta (figs. 44 and 

 47) spinulosus dentibius and foveicollis 



6. Cranium light orange to light yellow brown. With 6 sensory pegs 



at end of segment 3 of antenna, lacks long sensory seta (fig. 



44) frontera 



Cranium red brown to black. With long sensory seta and 5 sensory 

 pegs at end of segment 3 of antenna (fig. 45) 7 



7. Head capsule red brown; width usually less than 2.30 mm. Lateral 



lobe 3 of abdoiiainal segments 7 and 8 without setae . . sordidus 



Head capsule red brown to black; width usually greater than 



2.35 mm. Lateral lobe 3 of abdominal segments 7 and 8 with at 



least 1 seta each (fig. 22) 8 



8. Lateral margins of epipharynx with pronounced asperites (fig. 7). 



Epipharynx with at least 4 setae on each side caudolaterad of 



sensory area of haptomerum (fig. 7) unistriatus 



Lateral margins of epipharynx without asperites near base (fig. 4). 

 Epipharynx usually with 3 or fewer setae on each side caudo- 

 laterad of sensory area of haptomerum (fig. 4) 9 



9. Postclypeus usually with 3 long setae on each side. With 20 or 



more setae on lateral lobe of mesothorax. With 5 or more setae 

 on lateral lobe 2 of abdominal segment 9 (fig. 22) . . sonorae 

 Postclypeus with 2 or 3 setae on each side, if 3, then third is always 

 much smaller than other two setae. With less than 20 setae on 

 lateral lobe of mesothorax. Usually with 4 or fewer setae on 

 posterior lateral lobe of abdominal segment 9. 



plicatus, robinsoni, and tuberculatus 



