188 THE CANADIAN ENTOMOLOGIST. 



occiput. Body pale testaceous, with a faint brownish shade; thorax above, 

 except the posterior angles and tegulae, black, the sutures marked by pale 

 lines; abdomen with a broad black stripe above, not reaching quite to 

 the sides nor to the tip ; end of ovipositor sheaths black. Legs con- 

 colorous with body, the tips of posterior tibiae and their tarsi blackish ; 

 tarsi of two anterior pair of legs slightly dusky at the tips of the joints. 

 Wings hyaline, nervures black, stigma dull luteous or partly blackish. A. 

 black point in the outer half of second submarginal cell. 



^ Length, 4 mm. The black patch on the head has a slight lateral 

 projection, nearly touching the border of the eye ; there is a black line on 

 the pleura just below the wings and the venter is shaded with blackish 

 brown on prothorax and mesothorax. Otherwise as in the $ . 



Belongs to the group represented by the species suniptus^ pleuricus, 

 ribesii, lateralis, desmodioides, fulvipes, agilis, pallifrons, nevadensis and 

 trifurcatus, but does not seem to be identical with any of them. 



Eggs. — Laid in masses on the under side of a leaf, on the surface with- 

 out any saw-cuts. The dried, empty skins measure .8 x .4 mm. 



First larval stage. — Head .3 mm. wide, rounded, shining black as in 

 the next stage. 



Second stage. — Larvae eating holes in the leaf, near the eggs. Head 

 rounded, full at vertex, black; width, .5 mm. Body held S-shaped ; 

 thoracic feet blackish. Segments annulate shining greenish yellow, pale ; 

 the two rows of subventral tubercles visible, smoky ; none seen dorsally. 

 Anal plate small, black. 



Third stage. — Head as' before; width, .7 mm.; anal plate and spines 

 black. Lateral and subventral tubercles blackish ; subdorsal black spots 

 faintly indicated. Body light green; joints 2, 12 and 13 posteriorly 

 yellowish. Upon approaching a group of these larvae upon a tree, their 

 peculiar odour is very obvious. 



Fourth stage.— ki in the next stage, except that the black markings 

 are smaller. Width of head, i.o mm. 



Fifth stage. — Head well rounded; clypeus large, quadrate, smooth, 

 shining black, the sutures and antennae honey-yellow ; width, 1.4 mm. 

 Body normal for Nematus, terminal segments somewhat swollen. 

 Thoracic feet large, abdominal ones present on joints 6-1 1 and 13 (20 feet), 

 the last pair small. Five medioventral eversible pale yellow scent glands 

 behind the feet on joints 6-10. These function in the normal position of 

 defense of the larvae when the abdomen is held up in an S-shape. A 



