THE GENUS PISSODES. 



23 



vex than in the female, less evenly punctured and more shining 



toward the middle. The beak is stout, shorter, less shining, and more 



distinctly puncturetl. The inner apical tooth of the tibiae is usually 



more prominent. 



THE EGGS. 



The eggs are pearly white, slightly oblong, and equally rounded at 

 both ends. 



THE liARVA." 



The larva (Plate Y, ^1) is yellowish-white, cylindrical, footless, wdth 

 3 thoracic and 9 distinct abdominal segments, the anal lobes repre- 

 senting the tenth ; the thoracic 

 segments not distinctly larger 

 than the first abdominal. The 

 hairs of the second prothoracic 

 segment to the seventh ab- 

 dominal segment are small and 

 obscure; those of the head, first 

 prothoracic, and eighth and 

 ninth abdominal are longer 

 and more conspicuous. The 

 first thoracic segment has a 

 shining dorsal plate and some- 

 times a distinct sternal plate. 

 The ventral lobes of the three 

 thoracic segments have incon- 

 spicuous foot calli, each with 

 iine, erect hairs. The first 

 thoracic segment has a distinct 

 spiracle; the second and third 

 segments are without spiracles, 

 but the spiracles are distinct in the first to the eighth abdominal, and 

 are round and not oblong or oval, as in Hylobiina?. 



TJie head (figs. 5-8 and Plate V, A). — The head is light brown, 

 the anterior margin and mandibles much darker. When removed, 

 it is as broad as long (not including the mandibles), narrower in 

 front than at middle, the sides broadly rounded from middle to 

 apex, which is somewhat angular. The sides are nearly straight from 

 the middle to the anterior angles, and the lateral area has an oblique, 

 longitudinal, lighter area or stripe; the epicranial and frontal 

 sutures are distinct and much lighter in color in fresh specimens. 

 There are also 2 short, narrow, longitudinal stripes rising from the 



Fig. 5.—Pisso(les sitchensis: Head of larva, dorsal aspect, 

 o, Eye spot; b, frontal suturn; c, subdorsal stripe; 

 d, median line; e, epicranial suture. (Original.) 



c For anatomical nomenclature, see Hopkins, 1909, pp. 57-64, 

 57930°— 11 3 



