NO. 1108. PROCEEDINGS OF THE NATIONAL MUSEUM. 273 



EMESA MARCIDA, new species. 



Slender, moderately short, dull yellowish testaceous, the sides with 

 a slender black line throughout, including the head. Antenuie exceed- 

 ingly slender, a little shorter than the body; head about half as long 

 as the anterior division of the pronotuni, a slender reddish-brown line 

 each side of middle, the vertex and front of nearly equal length and 

 width; eyes very small. Thorax, dusky each side, and with a slender 

 red line along the middle. Anterior femora with a blackish line each 

 side inferiorly, and a red line above, armed beneath with long and 

 short black-tipped teeth; tibi;e about one-third the length of femora, 

 dusky at base and tip; tarsi slender, dusky at tip. Wings not present. 

 Middle and posterior femora twice banded with dusky near the tip; 

 tibiiit3 with four dusky bands basally. Tergum with two slender black 

 lines, and two red lines exterior to the others, angles of the segments 

 with piceous nodes; venter more or less dusky. 



Length to end of abdomen, 18 mm.; width of pronotum, '^ mm. 



Type.—^o. 3111, U.S.KM. 



Three specimens are in the collection. They seem to be nymphte, 

 and have no vestige of wing-covers. 



Family HYDEOMETKID.E. 



LIMNOBATES VITTATA, Stal. 

 Limnohaies {Hydrometra) rUtata, St.\l, Hem. Iresnl. Philipp, p. 705. 



Eight specimens of this neat and slender species were placed in the 

 collection. 



Family HYDROBATID^. 



HYGROTRECHUS REMIGATOR, Horvath. 

 fffigrotrecltns remigator, Horvath, Eut. Soc. Brux. C. R., 1879, p. cix. 

 Six specimens of this insect are in the collection. 



LIMNOTRECHUS ELONGATUS, new species. 



Olivaceous blackish-brown, opaque, elongated. Head moderately 

 long, gently curving before the eyes, occipital lobes large, entering the 

 sinus of the eyes and bounded inwardly by a curved, fulvous, impressed 

 line which crosses the middle; eyes hemispherical exteriorly, bounded 

 by a fulvous line interiorly, front bilobed, indented each side behind, 

 and with a slight knob before each indentation; apex of face fulvous, 

 ('i)atcd with silvery, rostrum reaching behind the anterior coxa', brown, 

 ])aU' fulvous at base, the short apical joint black; cheeks mostly yellow, 

 tlie throat silvery whitish; antenna^ brownish-black, very slender, as 

 long as from the tip of face to the end of posterior coxa", batal joint as 

 Proc. N. M. vol. xix 18 



