PLATE XII. 



Fig. 38b. — Beak of Entylia sinuata. b, tip of labrum; p, epipharynx; 

 I, labium; n, seta of maxillje. 



Fig. 39. — Interior of front of mouth, y, clypeus; x, mandibular 

 sclerite; n, distal tip of mandibular sclerite; h, hypopharynx; e, grooved 

 inner surface of epipharynx; z, tip of epipharynx, the portion beyond 

 labrum; I, edge of labmm, curving inward to help hold setae. 



Fig. 40. — View of the head on the side resting against the body. 

 y, cavity into head; m, muscle holding head to thorax; e, epicranial 

 suture; o, occiput; c, compound eye; t, tentorium, with its branches which 

 lead into the head and thorax; r, rod which supports the labium; n, floor 

 of mouth; x, maxillary sclerites; /, three joints of the labium. 



Fig. 41. — Back of head, with one maxillary sclerite removed to show 

 the mandibular sclerite which lies in front of it. o, occiput; x, maxillary 

 sclerite; p, maxillary process which guides the setse; s, maxillary seta; 

 y, muscle connecting the maxillary seta to the sclerite; m, mandibular 

 sclerite; 6, mandibular seta; v, shows the articulating joint which con- 

 nects the seta to the sclerite; n, muscle which holds the mandibular seta 

 to the cranium. 



Fig. 42. — Cephalic aspect of the head, with the mandibular and max- 

 illary sclerites pulled apart, e, epicranium; c, front face of the clypeus; 

 y, ventral face of the clypeus; d, mandibular sclerite; x, maxillary 

 sclerite. The cross indicates where the seta is joined to the sclerite. 



