346 KANSAS UNIVERSITY SCIENCE BULLETIN. 



After arriving at the above conclusions in naming the mouth 

 parts of S. vittatiim my attention was called to a paper by W. 

 Wesche,"' which describes and figures the mouth parts of 

 S. reptans L. The parts he has figured in plate IV of his paper 

 are the maxilla with its palpus and palpifer, the mandible, the 

 labrum with its two minute teeth, the hypopharynx, and the 

 labium. He classes Simulidse in a group of Diptera in which 

 all mouth parts are distinguishable except the labial palpi, 

 which are aborted. I felt very much gratified at finding his 

 paper to corroborate my conclusions. 



The descriptions of the female and male of Simiilium vitta- 

 fum, the list of North American species of the family Simu- 

 liidfe, and the key to the species of Simulium larvae, pupaj and 

 imagines given below are taken from 0. A. Johannsen's work 

 in the New York State Museum Bulletin 68, Aquatic Insects in 

 New York State. 



S. vittatum Zetterstedt. 



Ins. Lapponica (1844), p. 803. 

 (S. tribulatuni Lugger.) 



According to Coquillett, decoruvi Walk. (1848) and argus Will. (1893) 

 are synonyms. 



Female. Gray; nearly bare; dorsum of thorax with five black stripes, 

 the median one entire, the intermediate pairs interrupted, the exterior 

 pair spot-like. Each segment of the abdomen with a dorsal stripe and 

 basally on each side with a black spot, the penultimate segment black. 

 Wings whitish hyaline; halteres white; legs fuscous black, the front 

 side of anterior tibiae, the base of the middle and hind tibiae, and the 

 base of the middle and hind metatarsi white. Length 3 mm. Zetterstedt. 



Female. The abdomen grey, bases of segments 3 to 7 or 8 marked 

 with a velvet-black fascia produced backward in the middle and at the 

 ends. Length 2 to 4 mm. New York, Minnesota, Nebraska, Kansas, 

 California. 



Male. Hind tarsi bicolorous, mesonotum gray on sides and hind 

 margin, center largely velvet black; without gray streak extending in- 

 ward from humerus; sides of the abdominal segments 4 to 7 with silvery 

 white hairs. Coquillett.ii 



The markings of the female of this species seem somewhat 

 variable. The thoracic markings are usually quite distinct. 

 The median stripe is nearly of uniform width excepting at the 

 posterior end, where it becomes narrower; the intermediate 

 stripes are f-shaped, the extremities larger, the intermediate 



10. Wesi'he, W., The Month Parts of the Nemocora and their Kelation to the other 

 Families in Diptera ; Journal of the Royal Microscopical Society, pp. 28-47, 1904, pub- 

 lished in London. 



11. Bui. 10, m. s. 1898, p. 63. 



