THINOPHILUS — PEODES. 140 



Palpi in both sexes large, reposing upon the proboscis. Antenna) 

 very short ; the first joint without hair, the second short, trans- 

 verse, longer above than below ; the third joint circular, the bare 

 arista dorsal. Wings of equal breadth ; the posterior transverse 

 vein is distant from the margin of the wing more than its own 

 length ; the last segment of the fourth longitudinal vein is rather 

 parallel with the third. The abdomen of the male has six seg- 

 ments ; the hypopygiuni small, rather imbedded, and somewhat 

 turned inside ; its exterior appendages are narrow, parallel lamellae. 

 The abdomen of the female shows five segments. Femora rather 

 strong, the first joint of the hind tarsi without bristles. 



The species of Thinophilus are easily distinguished from the 

 species of Diostracus by the absence of hair upon the first joint 

 of the antennae ; from the species of Peodes they differ by the 

 structure of the face and of the hypopygiuni. 



They live principally along the shores of the sea, whence their 

 name (from 3*'$, down, sand hill, and yl-kos, friend). 



As yet only European species have been made known. 



Gen. XXIV. PEODES. 



Characters. Face not reaching as far as the lower corner of 

 the eye, rather narrow in both sexes, though a little broader in the 

 female, and more enlarged below ; the lower margin is straight. 

 Palpi in the female considerably larger than those of the male and 

 in both sexes reposing upon the proboscis. Antennas very short ; 

 the first joint without hairs; the second short, transverse; the 

 third joint rounded ; arista dorsal, only with a short pubes- 

 cence. Wings of uniform breadth ; the posterior transverse vein 

 is removed from the margin of the wing more than its own 

 length ; the last segment of the fourth longitudinal vein parallel 

 with the third. The abdomen of the male has six segments ; the 

 short, stout hypopygiuni is not imbedded, but disengaged and a 

 little inflected ; its exterior appendages are two small parallel 

 lamellae alongside of each other and with long hair ; the interior 

 appendages form a remarkably large curved forceps. The abdo- 

 men of the female shows five segments. The femora are rather 

 strong ; the first joint of the hind tarsi has no bristles. 



Peodes is closely related only to Thinophilus ; the differences 

 beeome evident when the characters of both genera are compared. 



