376 NEW YORK STATE MUSEUM 



the pupa, in stating that there were but eight; for, on examina- 

 tion of the Cambridge material, nine filaments were counted. 

 Coquillett (1898j says of the male mesonotum, '' usually with 

 three black vittae"; but this I have found to be an exception 

 rather than a rule. 



Recorded from New York, Texas, California, and Moscow Id. 

 (Collected by Aldrich). 



Larva. Length 10 to 12mm. Plate 36. 



The fans of this species have about 60 rays; the cilia and 

 the regularly arranged setae on the inside of the rays are very 

 distinct. The antennae, light brown in color, are three jointed, 

 the second joint about one third as long as the first, the third 

 very short and pointed, the extremities of the first and second 

 are hyaline, the two small budlike processes at the end of the 

 first and the second joint are brown. The mandibles possess 

 the apical pair of bristles, the apical teeth are quite black, the 

 others paler; the maxillary palpus with a few scattered bristles 

 on the shaft and at the base. Labrum and hypopharynx as 

 usual, in the latter the lateral hornlike processes are quite 

 prominent. Labium with the toothed area rather narrow, the 

 lateral and middle teeth elongate, the ventral surface with two 

 rows of 10 or 11 bristles each [fig.3]. The thorax and abdomen 

 are a deep black; paler at the incisures, and on the ventral sur- 

 face, particularly toward the caudal end. A narrow black 

 longitudinal, ventral stripe is often present. The blood gills 

 consist of three many branched papillae. 



Pupa. The two thoracic respiratory organs each consist of 

 nine filaments; eight of which are about equal in length, the 

 ninth arises a little lower on the shaft, and is somewhat shorter 

 [fig.8]. On the dorsal surface of each of the segments 2, 3, 4, 

 and 8, are eight black hooks curved cephalad, those on the 

 second and the eighth segments being much smaller than the 

 others. Ventrally 5, 6 and 7 each, with four double, curved 

 hooks, on the caudal segments are two very short blunt spines, 

 and three smaller ones on each side of 3, 4 and 5. The pupal 

 case is of the boot-shaped type [pl.35, fig.5]. 



S. piilchrum Philippi 

 Chilian Diptera. 186-5. p.C33 

 181)6 ^. tarsale Willisron. I>ii)t. of St Viuceut, p.268 



Female. Abdomen black, the proximal segments opaque, the 

 distal four segments shining. Length 2mm. 



Front and face black, with a light gray reflection. Antennae 

 yellow; the distal joints somewhat brownish. Mesonotum deep 



