368 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Coquillett adds the following: "Female. Abdomen gray, 

 bases of segments 3 to 7 or 8 marked with a velvet-black fascia 

 produced backward in the middle and at the ends, length 1 

 to 4 mm. Found in New York, Minnesota, Kansas, Illinois, 

 and California." 



Male. Hind tarsi bicolorous, mesonotum gray on sides and 

 hind margin, center largely velvet-black without gray streak 

 extending inward from humerus, sides of abdominal segments 

 4 to 7 with silvery white hairs. (Coquillett.) To this Johann- 

 sen adds: "The markings of the female of this species seem 

 somewhat variable, the thoracic markings are usually quite 

 distinct, the median stripe is nearly of unifoi-m width except- 

 ing at the posterior end where it becomes narrower; the in- 

 termediate stripes are y shaped, the extremities larger, the 

 intermediate portion usually a hair line, sometimes obsolete, 

 the exterior pair usually elongated spots. The abdominal 

 markings are as described by Coquillett, though occasionally 

 there are additional disconnected, velvet-black lateral spots, 

 one on each side on segments 3, 4 and 7, and a pair on 5 and 6. 

 Sometimes, also, owing either to the contracted condition of 

 the abdomen or to the fasciae being narrow, only the black 

 projections of the fasciae are visible on the more posterior 

 segments, giving the appearance of three spots on each. The 

 legs are often gray, the femorse and tibiae paler at the base, the 

 tibiae black at tip, the tarsi deep black except basal portion of 

 middle and hind metatarsi, fore tibiae with one spur, middle 

 and hind with one pair. Tarsal claws of female simple. 



Larv^. Caudal blood gills, 3 simple papillae; the middle 

 tooth of the labium simple and pointed, labium with six pairs 

 of setae on its ventral surface; somewhat mottled gray, the 

 sides of each segment blackish; the head is of the usual red- 

 dish-brown color, the pale yellow antenna long and cylin- 

 drical, the second joint about one-third of the length of the 

 first; the third is a pointed process at the tip of the second. 

 The fans have about 40 rays, the cilia being relatively minute ; 

 the mandibles are provided with three large apical teeth be- 

 sides the row of secondary ones ; the apical pair of bristles is 

 present; the maxillary palpus has a few spines, and a tuft 

 of a few spines on the basal joint; hypopharynx and labrum 

 apparently like those of other species ; the labrum has an elon- 

 gate middle tooth, those at the end nearly as long, the inter- 

 mediate ones short and there are six bristles in each of the 



