368 NEW YORK STATE MUSEUM 



Pupa. The cast pupal skin has practically the same charac- 

 teristics as those given for Sayomj^ia albipes Johans. 



Larva. Head somewhat elongate, subconic; basat segment of 

 antenna deeply notched at base and tipped with four nearly equal, 

 tapering processes and one about half as long. Just behind the 

 antenna are eight pale, long filaments, four on each side, the 

 filaments of the third metamei^e of Meinert. Leaf like appendages 

 extremely slender, rounding gradually anteriorly to a somewhat 

 slender base. Posterior margin nearly straight, terminating in 

 an extremely long pointed process, the latter being nearly half 

 the entire length of the appendage; at its base, anteriorly, there 

 are several rather large, irregular teeth. Labrura quadrate, 

 elongate, obliquely truncate, tipped with an irregular tuft of 

 stout hairs. Mandibles with three conspicuous teeth, the middle 

 one with a small dentition near its base; there are two long, 

 curved processes and two shorter, conical ones around the teeth 

 proper. Mandibular fan composed of seven long, curved spines. 

 Eyes deeply pigmented, as is also the case with the air sacks of 

 the thoracic and seventh abdominal segments. Ventral tuft of 

 terminal segment composed of about 16 rather stout, simple hairs. 

 Ventral plate very pale fuscous, bearing stout, evenly curved 

 hooks pointing anteriorly; lateral margin of terminal segment 

 bordered with rows of inconspicuous teeth extremely difficult 

 to detect. Dorsal tuft composed of four long, finely plumose 

 hairs. 



Sayomyia americana Johans. 



This species occurs according to Johannsen in New York, New 

 Jersey, Illinois and Minnesota. It was first characterized by him 

 as a variety of S. plumicornis Fabr., but on comparison 

 with European specimens, kindly sent us by Dr Meinert of Copen- 

 hagen, we conclude that Johannsen's form is entitled to specific 

 rank. His description follows : 



Male. Eeddish brown; abdomen yellowish; the antennal joints 

 yellow with brown tips, basal joint brown; the hairs pale brown; 

 the front, the upper surface of the proboscis, and the palpal joints 

 brown; the incisures of the latter yellow, the vertex, the cheeks 

 and the underside of the proboscis and neck pale yellow ; thorax 

 pale brown above with three dark reddish brown stripes, the 

 middle one divided by a fine, pale brown line; the lateral stripes 

 abbreviated anteriorly, the median one posteriorly ; the pectus and 

 the margins of the pleural and jugular sclerites reddish brown; 

 scutellum pale brown ; metathorax dark brown ; abdominal seg- 

 ments subequal in length except the first and last, whiqh are less 



