42 THE CANADIAN ENTOMOLOGIST. 



DESCRIPTIONS OF THE LARV^ OF CERTAIN TENTH- 



REDINID.^. 



BY HARRISON G. DYAR, NEW YORK. 

 (Continued from Vol. XXV., page 24.8.) 

 Monostegia qiiercus-coccinece, n. sp. 



Eggs apparently inserted by a series of thrusts of the ovipositor 

 parallel to the midrib of the leaf. The saw cuts under the upper 

 epidermis are confluent, forming a long blotch over 1 mm. wide and about 

 20 mm. long, running close to the midrib. The larvae feed gregariously, 

 eating the lower epidermis and parenchyma. 



First stage. — Head oval, higher than wide, mouth pointed ; blackish- 

 brown, nearly black on vertex, shining ; mouth pale ; width, 0.25 mm. 



Second stage. — Head shining, pale brown, darker around the black 

 ocellus, pale around mouth ; jaws dark ; width, 0.4 mm. 



Third stage. — Head oval, yellowish testaceous, shining ; a brownish 

 shade across between the black eyes; mouth dark; width, 0.55 mm. 

 Body thick through the thoracic segments slightly flattened, of even 

 width posteriorly. Thoracic feet scarcely visible from above, pale. 

 Abdominal feet on joints 6-12, joint 13 not touching the leaf in walking, 

 but appears to possess a rudimentary pair of feet. Body entirely shiny, 

 sticky, translucent whitish, shading into orange-yellow at the front and 

 sides of thorax. Alimentary canal appearing by transparency dark green. 



Fourth stage. — Head orange-yellowish, iransparent ; eye black; an- 

 tennae projecting before, conical ; width, 0.8 mm. Body as before. 

 Alimentary canal blackish or green. Dorsal vessel and tracheae very 

 plainly visible, the latter white, branching into fine ramifications, con- 

 nected along the stigmatal line. 



Fifth stage. — As before, but the body is very slightly milky, not, how- 

 ever, obscuring the internal parts, which are visible. Head, j.i mm. in 

 width. The dorsal vessel shows plainly, contrasting with the milky- 

 whitish body. 



Sixth stage. — Head light-yellowish, eye black ; width, i.i mm. Body 

 shaped as before, but whitish, tiot shining., faintly 3-annulate, the internal 

 organs obscured. The colour shades into orange {not ocherous-orange as 

 before) on the thorax anteriorly and laterally ; the alimentary canal giv- 

 ing a purplish median shade, centered by the darker dorsal vessel. Upon 

 arriving at this stage, the larvae leave the tree and form little elliptical 

 cells in the ground for pupation. 



