116 MAUD D. HAVILAND 
Trxt-Fric. 14. 
de. St. 
Vertical section through the posterior region of the body of a larva 
of the fourth instar. x 350. a.=anus. ct.=cuticle. dc. st.= 
imaginal disk of stylets. dc. s. v.=imaginal disk of sheath and 
valves, fb.=fat body. gn. 10.—ganglion of segment 10. hp.= 
hypoderm. m.ep.=wall of mesenteron. mes,=mesenteron. 
pr.am.=ampulla of proctodaeum. pr.=proctodaeum. 
two oval bodies, the testis being more elongated than the ovary 
(fig. 9). The complete development of the accessory genital 
apparatus was not observed, but im the fourth instar the 
female armature exists as two imaginal disks on the eleventh 
and twelfth segments. In Lygocerus the relationship 
of the parts is somewhat obscured, owing to the curvature of 
the body and crowding together of the segments in the posterior 
ventral region, but my observations on the origin of the 
fb. 
pr 
