40 U.S. NATIONAL MIISEUIVI BULLETIN 2 79 



each side. Anterior region of pedium usually with 4 sensory spots distad 

 of slightly arching, transverse row of about 12 to 20 sensory spots; the 

 4 sensory spots widely separated, as 2 groups of 2 each, or intermixed 

 with main transverse row of sensory spots. Pedium with numerous 

 phobae except in anterior median region and in posterior area between 

 fused phobal masses. Pedium with fused phobal mass on each side near 

 posterior border. Paria with anterior and posterior group of setae on 

 each side. Posterior setae much stouter. Anterior setae tending to 

 intergrade with marginal setae and posterior setae, especially on right 

 side of epipharynx. Setae usually more numerous on right side. Tormae 

 symmetrical, united medially, with prominent pternotorma on each 

 side. Haptolachus with 2 sclerotized, elevated plates and median sense 

 cone. Sclerotized plates unequal; left plate smaller. Sense cone with 4 

 sensory spots in central hyaline region. Sense cone also with small to 

 large group of pigmented phobae at anterior end in some species. 

 Central hyaline region of sense cone occasionally traversed by longi- 

 tudinal bar. Paired macrosensillae located laterad of sense cone in 

 membranous area on each side. Glossa (figs. 10 and 12) with 4 sensory 

 spots and about 10 to 30 setae dorsally. Labial palpi two-segmented; 

 basal segment with distal fringe of phobae on lateral aspect. Hypo- 

 pharynx (figs. 10 and 12) divided into smaller distal area and larger 

 proximal area. Distal area with 2 larger sensory spots distad of trans- 

 verse row of about 14 to 23 smaller sensory spots with minute setae. 

 Lateral areas each with slightly oblique row of densely set phobae ex- 

 tending to base of labial palpi. Larger proximal area with symmetrical 

 subtormae adjoining medially and bearing paired subapotormae. 

 Right subapotorma with prominent, dense group of phobae at apex 

 (absent in 0. rubricans). Proximal area also with row of inwardly 

 directed, closely set phobae laterad of each subapotorma, row ex- 

 tending length of proximal area. With prominent, elevated, sclerotized 

 process located anterior to point where subtormae adjoin. Maxilla 

 (fig. 49) with galea and lacinia separate. Lacinia with 3 prominent 

 unci, numerous stout setae along median border, and 1 to several finer 

 setae bordering stout setae on dorsal surface. Two-segmented galea 

 with whorl of 5 setae at base of terminal uncus; with 1 seta at base of 

 galea on ventral aspect. Four-segmented maxillary palpus with 1 seta 

 on basal segment and 2 setae on segment 3. Stipes with 1 to 12 setae on 

 exterior surface. Maxillary stridulatory area with longitudinal, straight 

 row of about 20 to 60 stridulatory teeth. Mandibles (fig. 48) darker 

 than head capsule; with 2 well separated setae in dorsal exterior 

 groove. Left mandible slightly longer. With small, sharp tooth (S3) 

 proximad of scissorial notch of left mandible. With larger, rounded 

 tooth (S2) proximad of scissorial notch of right mandible. Both man- 

 dibles with prominent tooth (S3 of right mandible and S4 of left mandible) 

 on inner margin between scissorial and manducatorial areas. Addi- 



