LiMNOpniLUS. 257 



10. L. externus! 

 Limnophilus externus Hagen I 



Luteous; head and thorax obscnre above, with.luteous hair; 

 antennae (base) luteous; feet ochreous, with black spines; apex 

 of the abdomen obscurer ; anterior wings shining, narrow, hardly 

 luteo-pilose, luteous, densely guttated with fuscous, the marks often 

 confluent ; a rhombical spot upon the middle, which is oblique, 

 narrow, hyaline ; the anterior margin immaculate ; at the anasto- 

 mosis are a few spots; veins luteous, the fourth apical areole narrow 

 at base, shorter than the rest ; posterior wings luteo-hyaline. 



Female. The four anal appendages almost equal, short, acute ; 

 the valvule short, incised. 



Length to tip of wings 20 millim. Alar expanse 38 millim. 



Eab. N. Red River (Kennicott). 



11. L. gravidus ! 



Limnophilus gravidus Hagen ! 



Rufo-fuscous; antennae (at base) with luteous hair; head and 

 disk of the thorax rufous, with luteous hair, each side with black 

 hair ; abdomen luteous beneath ; feet luteous, with black spines, 

 base of the four anterior tibiae, as well as their middle and apex, 

 and the apex of the posterior tibiae, black, apex of the tarsal arti- 

 cles black ; wings long, broad at the apex, a little rounded, sparingly 

 clothed with white hair ; surface grayish-hyaline, closely pointed 

 with fuscous, points often confluent ; an oblique, discoidal streak, 

 and a semicircle at the apex of the anastomosis, pale hyaline ; veins 

 pale, sparingly interrupted with fuscous; posterior wings luteo- 

 hyaline, their apex obsoletely spotted with fuscous, and an obscurer 

 spot at the pterostigma. Female. 



Hal. North California. 



12. L. vast us ! 

 Limnophilus vastus Hagen ! 



Nigro-fuscous; base of antennae fuscous; head and thorax with 

 black hair; mesothorax black, a grayish spot upon the middle, and 

 each side behind marked with a black point; feet luteous, with 

 black spines; four anterior tibiae at base, middle and apex, apex 

 of the posterior tibiae, and apices of the tarsal articles, black ; 

 wings long, broader at the apex, elliptical, grayish-hyaline, almost 

 17 



