306 HARRISON G. DYAR. 



^eiiiatiis Iliidsoiiii inagniiiii n. sp. 



Larva. — Sitting ou the. edge of a leaf and thrashing the abdomen about when 

 disturbed. Head normal, round, black, sutures paler ; width 2.2 mm. Thoracdc 

 feet moderate, j)ale, abdominal ones on joints 6-11, 13, well developed ; short 

 black anal spines. Body smooth, shining, faintly 3-annulate. dorsal vessel yel- 

 lowish ; color bluish or leaf-green, with a series of orange-yellow, large lateral 

 blotches on joints 3-12 and numerous black spots as follows : two transverse rows 

 per segment above the spiracles, the anterior of three on each side, the posterior 

 of four, its lower (lateral) one largest; two black patches on the halves of the 

 subventral ridge, the lower posterior one somewhat broken ; on joint 13 a large 

 lateral black patch and dorsal suranal blackish cloud. 



Imago.— Female: length 9.5 mm. Black, lateral lobes of mesothorax dark 

 brown. Abdomen yellowish ferruginous, except basal plates and extreme tip. 

 Wings hyaline, a faint dusky shading below stigma ; posterior angles, labrum and 

 palpi, tegula; and legs pale, coxse black at base, posterior coxa; and all the femora 

 largely yellowish ferruginous, apical three-fourths of posterior tibise and their 

 tarsi black. 



Mr. Marhitt has coiifirined my (letermination that this species is 

 undescribed. 



Two larvfe on pophir at Plattsburgh, N. Y. 



This rather large fly is^ named for my friend, Prof. George H. 

 Hudson. 



Nemattis corylus Cresson.* 



Third stage. — As in the next stage, but less green, more sordid yellowish ; all 

 shining, subventral black spots distinct, anal plate black, contrasting, contiguous 

 to a small spot below the anus; width of head .7 mm. 



Fourth stage. — Head shining black ; width 1.0 mm. Body shining green, a little 

 paler than the upperside of the alder leaf; dorsal shading (of the next stage) 

 scarcely indicated, except as a dusky subdorsal shade on thorax, but anal plate 

 black ; subventral folds black, forming two black spots per segment, the upjier 

 anterior, the lower posterior. Thoracic feet black at base and tij) ; median ven- 

 tral black spots present, but abdominal feet concolorous with body ; not opaque, 

 the tracheal line visible ; setse on two annulets. 



Fifth stage. — Head shinijig brown, sordid, eye black on a diffuse spot; width 

 1.4 mm. Body indistinctly annulate. Feet on joints fi 11, small on 11 ; thoracic 

 feet moderately large. Body long, slender, green, of a dark tint, the spiracular 

 area on each segment faintly discolored, yellowish ; dorsal area completely shaded 

 in black, slightly metallic (bronzy) ; double subventral folds, abdominal feet out- 

 wardly and a row of medio ventral dashes black ; sometimes a little black stig- 

 matal spot. Thoracic feet pale, marked with black above on joints and claw; 

 anal plate black ; setse minute, dark. 



Cocoon. — An oval brown structure at the surface of the ground, as usual in the 

 genus. 



Slender, gregarious edge-eaters on alder, with five long, slender, 

 eversible, medio-ventral scent glands, emitting an unpleasant odor, 



"•■■• These larvae differ from those described by me under the same name (Can. 

 Ent. xxvi, 44), but perhaps not to a specific degree. 



