244 



HANDBOOK OF INVERTEBRATE ZOOLOGY. 



remnant of the suture formed by the union of the halves 

 or paired appendages which the kbrum represents. 



g. On the side of the head notice a suture which runs 

 from the lower anterior angle of the. eye to the lower 

 margin of the epicranium, and separates the latter from 

 the large plate, iha gena (Figs. 129 and 130, i), which 

 forms the side of the head, and terminates belwv in a free 

 pointed edge. 



h. Between the lower anterior edge of the gena and the 

 clypeus is a dark-colored area, the outer surface of the 

 basal portion of the mandible (Figs. 130, o, and 131, B). 



views of the 

 head, showing all these 



i. Make drawings of the front and side 



points. 



Fig. 131. — Mouth-parts of 

 AcridiumAmericanum. (Drawn 

 from nature by W. K. Brooks. ) 



A. Anterior surface of the 

 labrum. e. Clypeus. (j. La- 

 brum. (J . Terminal bilobed 

 portion. h. Suture. B. An- 

 terior surface of mandible. 

 C. Posterior siuiace of maxilla. 

 ca. Cardo. st. Stipes, mp. Max- 

 illary palp. ?o. Lacinia. jya. Gal- 

 ea. D. Posterior surface of 

 labium, gu. Gula. sm. Sub- 

 mentum. prj. Palpiger. m. Meiv- 

 tum. Ig. Ligula. n. Lab^ 

 palp. E. Metastoma. 



k. Remove the head by cutting the soft integument of 

 the neck, and raise the labrum by its free edge and cut 

 it off. Under it note the large, black-tipped, toothed 

 mandibles (Figs. 130 o, and 131, B) meeting each 

 other upon the median line ; their outer ends running 



