ALEXANDER, BLEPHAROCERID^ AND TANYDEEID^. 5 



The family Tanyderidae includes the most generallized 

 of the living crane-flies. It is a very small group with but 

 three known valid genera and ten species. An additional 

 iindescribed species of this family was kindly sent to me 

 for naming by Dr. Sjöstedt. This species belongs to the 

 typical genus Tanyderus of which it is the seventh species 

 to be made known. Of these seven species, four are Au- 

 stralasian, the three remaining forms being confined to the 

 southern parts of South America. 



The three American species may be separated by means 

 of the foUowing key: 



1. No supernumerary cross-veins in any of the cells of 



the wings. 



T. gloriosus, sp. n. 



One or more supernumerary cross-veins in the radial 



cells of the wings. 2. 



2. A cross-vein in cell R^. T. pictus Philippi. 

 Cross-veins in cells B 3 and B 5. 



T. patagonicus Alexander. 



Tanyderus gloriosus, sp. n. 



Antennae slender, 18-segmented; mesonotal prsescutum 

 with a broad brown median stripe; legs with the femora 

 and tibise tipped with dark brown; wings hyaline with a 

 heavy dark brown träns verse pattern; no supernumerary 

 cross-veins in any of the cells of the wing; abdominal ter- 

 gites black with a large orange-yellow blotch on either side 

 of the median line at the base. 



Male. — Length 18 mm; wing, 17,2 mm, Middle leg, 

 femur, 8,8 mm; tibia, 9,6 mm; mebatarsus, 7,7 mm. Hind 

 leg, femur, 9,2 mm; tibia, 11,5 mm; metatarsus, 7,5 mm. 



Rostrum and palpi dark brown; the mouthparts in ge- 

 neral appearance about as in T. patagonicus Alex. (Pro- 

 ceedings of the United States National Museum, vol. 44, no. 

 1953, pp. 331—335, figs. 1—3; 1913). Antennae with 18 seg- 

 ments, dark brownish black, the apex of the second scapal 

 and the base of the first flagellar segment more yellowish 

 brown; basal flagellar segments cylindrical but the inter- 

 mediate and apical segments very long and slender, clothed 

 with a dense påle pubscense and with long verticils; last 

 segment short. Eyes rather narrowly separated by the 

 vertex, densely short-hairy. Head dark brown, the occiput 



