332 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 44. 



spot, and the space before the scutellum is likewise yellow; remainder 

 of the pleurjB yellow with black spots; metanotum is yellowish with 

 four black s])ots on the caudal margin. The segments of the abdomen 

 are yellow with black ])osterior etlges and black longitudinal spots, of 

 which there are four on the dorsum in two rows. The wings have 

 yellow veins and a yellowish membrane, especially in the middle* 

 and there are ramifying, yeUow, black-bonlered crossbands, which 

 make this species one of our most beautiful Tipulids. The legs are 

 yellowish with black coxse and a blackish ring above and below the 

 knee; they are rather strongly haired. Halteres are black with 

 bright stem. 



The species has an extremely sharp anal angle and possesses a 

 supernumerary cross vein in cell /?, of the wing. 



e- 



FiQ. 1.— Lateral aspect of the head op Tanydeeus patagonictjs. a. Antenna; 6, clypkpsj 



C, MAXILLARY PALPUS; d, LABRUM; «, MAXILLA; /, HYPOPHABYNX (?); g, HYPOPHABYNX (?); h, 

 LABIUM. 



TAITYDERUS PATAGONICUS, new species. 



Antennae 17-segmented; thorax gray with chestnut stripes; anal 

 angle of the wings not ])rominent ; supernumerary cross veins in cells 

 i?a and 7?5; wings market! with brown and gray. 



Female. — Length, 12.1 mm.; wing, 18.2 mm. Legs, posterior 

 femora, 8.2 mm.; tibia, 9.8 mm. 



Head. — Mouth parts, ch'7)eus (6) rather quadrate, about as broad 

 as long; the labrum closely applied to its ce])ludic margin. Labrum 

 (d) elongate, dei)rcssed, flattened, its edges toward the tip, with 

 numerous stout haii-s; underneath the labrum is a pair (e) of elon- 



