ENTOMOLOGICAL SECTION. Vll 



%. — Face, sides of thorax and metathorax with a pale golden pile; clypeus, 

 mandibles except tips, dot at summit of eyes, sides of prothorax except a tri- 

 angular black mark before tubercles, spot on posterior middle of mesothorax, 

 spot at apex of scutellum, most of tegulse, spur of anterior trochanters, tips of 

 all the femora, the tibiae except line at sides and beneath, and their tarsi more 

 or less, yellow; abdoiaen ornamented as in J. Length .22 — .25 inch. 



Hab. — Nevada, (H. K. Morrison). Three 9 and two % specimens. 



Mr. Cresson read the following descriptions of three new species 

 of Trigonalys. 



Trigonalys me.'Kicanus. — %. — Black, immaculate, clothed with a very 

 short black pubescence; head smooth and polished, piceous; thorax and ab- 

 domen opaque, very densely and rather coarsely sculptured; wings dark 

 fuscous, the apical third whitish hyaline, second submarginal cell narrow, 

 pointed to base of wing, and connected with second discoidal by a short petiole, 

 third submarginal more than twice longer than wide, receiving the second 

 recurrent nervure near the base; legs piceous; abdomen pyriforin, convex, 

 pointed and incurved at tip. Length .60 inch. 



Hah. — Mexico, (Sumichrast). Two specimens. 



Trigonalys Iseviceps. — 9. — Black, immaculate, clothed with a very 

 short lilack pubescence; head smooth and polished, piceous; thorax and ab- 

 domen opaque, densely and confluently punctured, almost granulated: wings 

 subhyaline, with the costa broadly fuscous, covering at tip the marginal and 

 submarginal cells, neuration much as in mexicanus ; legs piceous, the process 

 at tip of second ventral segment of abdomen short and truncate. Length 

 .40 inch. 



Hab. — Mexico, (Sumichrast). One specimen. Very much like 

 mexicanus, but easily separated by the different ornamentation of the 

 anterior wings. 



Trigonalys nevadensis. — ^. — Black, clothed with a very short pale 

 pubescence; head and thorax confluently punctured; basal joints of flagellum 

 more or less dull ferruginous; tubercles, two spots on scutellum, tegulse in 

 part, knees, tibiae, and base of tarsi, yellow; wings yellowish subliyaline, 

 dusky towards tip, second submarginal cell subsessile with second discoidal, 

 third submarginal subquadrate, rather longer than wide, receiving the second 

 recurrent nervure a little before the middle; abdomen finely punctured, shin- 

 ing, a broad band at apex of second and following segments, and a triangular 

 spot at apical corners of second ventral, yellow, the anterior margin of the 

 yellow bands on dorsal segments uneven; the process at tip of second ventral 

 truncate. Length .40 inch. 



%. — Ornamented like the 9 > except that the second and following ventral 

 segments have a yellow band at tip, narrowed medially and more or less inter- 

 rupted ; the two yellow spots on scutellum are sometimes confluent. Length 

 .35 inch. 



Hab. — Nevada, (Morrison). Ten specimens. The neuration of the 

 anterior wings of this species is the same as that of jmllatus Shuck. 



Dr. Horn made some remarks on the various species of Mycterus 

 inhabiting the United States, showing first their trivial diiferences, 



