183 



AN UNDESCKIBED SPECIES OF CLYTOCOSMUS SKUSE. 



(Tipuliilae, Dipti'i'ii. ) 

 ISv C"n.u!i,Ks P. Alkxaxder. Pii.D., Ukuana, Illinois, U S.A. 

 {Communicated hij It. J. Tillyanl. M.A., D.Sc, F.L.S., F.E.S.) 



The gemis ('liitocoNmii.y was erecteil by Skuse* to receive the reinarkablv 

 beautiful new species of crane-fly, Clytocofimits helmsi, from Mt. Kosciusko, New 

 South Wales. The senus has remained monotypic until the present day. Through 

 the kindness of Dr R. J. Tillyard, I am now able to describe a second species, a 

 superb fly from the Dorrigo Tableland, about three hundred miles north of Syd- 

 ney. Some time ago Dr. Tillyard wrote me that he had once found a magnificent 

 crane-fly in the Northern scrubs with much the general appearance of a great 

 robber-fly. The only specimen then in his possession was an injured female in 

 rather poor condition to be made a type. An effort was made to secure additional 

 specimens during March and April, 1919, when the insect was due to appet^r on 

 the wing, but a prolonged drought, followed by floods, badly damaged the habitat 

 frequented by this fly, and it was impossible to secure more material at this tune. 

 Dr. Tillyard has kindly sent me the unique specimen above discussed, and it is 

 made the type of tiie new species descrilied herewith. It is with great ple.'jsure 

 that this exquisite creation is dedicated to Dr. Tillyard, through whose kindlv 

 interest the species was first made known to science. The type has been returned 

 to Dr. Tillyard. and will ultimately be placed in the Australian Museum w'ith the 

 Skuse types. 



The two known species of Chjtocosmiis may be separated by means of the 

 following key: — 



Prothorax black; mesonotal praescutum orange with a black spot anteriorly; 

 pseudosutural foveae black; scutellum and postnotum velvety black; thoracic pleura 

 velvety black with brown and white spots; abdomen velv'jty black with white spots, 

 only the genital segment reddish fulvous helmsi Skuse. 



Prothorax orange; mesonotal praescutum orange without black markings; pseu- 

 dosutural foveae orange; concolorous with the remainder of the praescutum; scu- 

 tellum and postnotum orange; thoracic pleura orange with white spots; abdomen 

 orange with tergites one, the caudal part of three, and segments four to seven black 

 with white spots tillyardi n.sp. 



Clytocosjius tillyardi, n.sp. 



General colouration fiery orange, the thoracic pleura spotted with white', legs 

 black; wings yellow the posterior and anal cells with paler centres; abdomen with 

 the basal tergite black with lateral white spots; intermediate tergites (three to 

 six, and the caudal part of two) similar to the basal tergite; remainder of the 

 abdomen orange. 



?■ — Length, 33 5 mm.; wing, 22 mm.; head alone, 5 mm.; thorax alone, 7.5 

 mm.; abdomen alone, 21 mm.; hind leg, femur, 13 mm.; fore leg, femur, fl mm.; 

 tibia, 9.2 mm. 



Frontal i)rolongation of the head bright orange, long and slender (2.3 mm.), 

 with no indication of a nasus; dorsal surface with small, scattered, erect or 



•Proc. Linn. See, N. S. Wales, 2nd. Ser., V., 1890, pp. 74-76, 



