288 PROCEEDINGS OF THE ACADEMY OF 



D. marmorata. Cinereo-fusca, tborace vittis tribus fuscis, alis cinereo nebu- 

 losis, stigmate quandrangulari, fusco ; long. 0'4. 



Proboscis, palpi and antennas brown ; joints of the latter subglobular, ver-. 

 ticils short ; front and vertex cinereous, darker in the middle ; thorax cinereous, 

 with three brown stripes; abdomen brownish cinereous, posterior margins of 

 the segments pale ; halteres pale ; feet yellowish, tips of femora, of the tibiae 

 and of the tarsi brown ; wings subcinereous with some darker clouds and some 

 hyaline bands and spots ; a cloud at the origin of the petiole, another, round 

 one, at the tip of the petiole ; crossveins also clouded ; stigma obscure-cinereous, 

 elongated, quadrangular ; the hyaline spots are arranged in the following way : 

 a small rounded one in the anal angle ; a band running across the basal portion 

 of the prae-, pobrachial and anal area? and ending in the axillary near the 

 posterior margin ; a spot in the anal area near the tip of the axillary vein ; a 

 large irregular hyaline space in the central portion of the wing, enclosing the 

 stigma and the two clouds of the petiole, and extending more or less towards 

 the posterior margin, across the discal and the externomedial areolets ; its out- 

 line is very indefinite, and it is interrupted by clouded marks along the veins; 

 a small hyaline mark at the tip of the wing, in the cubital vein. The tip of 

 the mediastinal vein almost corresponds to the origin of the petiole ; the medi- 

 astinal crossvein is a short distance before its tip ; the discal areolet is present 

 (closed) and the great crossvein corresponds to its base. 



California, two $ specimens. (Mr. A. Agassiz). This species is related to 

 D> kumidicola, 0. S. 



LIMNOBIA nob. , 



L. californica. Thorax vittis quatuor ; alae fuscescentes, pallide fenestrates, 

 margine anteriore maculis quatuor fuscis; long. 0-7 0-8. 



Front and vertex brown ; underside of the head and sides of the occiput yel- 

 low ; proboscis, palpi and antennae brown ; two basal joints of the latter yellow. 

 Thorax yellowish, mixed with brown ; prsescutum with four brown stripes ; the 

 intermediate ones narrow, parallel; at their anterior end, they coalesce with 

 the brown margin to the preescutum, which is broadest at the humeri ; lateral 

 stripes abbreviated anteriorly and extending over the scutum posteriorly; scu- 

 tellum, metathorax and pleurae more or less tinged with brownish ; base and tip 

 'of halteres pale, the intermediate portion infuscated ; femora brownish ; a yel- 

 low ring before the tip, which is black ; tibiae ferruginous-brownish, brown 

 at tip ; tarsi ferruginous-brownish at the base, the remainder brown. Winga 

 with a brownish tinge ; four large brown spots along the anterior margin ; the 

 first at the basis of the praebrachial area ; the second at the origin of the 

 petiole, somewhat trapezoidal ; both do not cross the subcostal vein, and do 

 not therefore reach the anterior margin ; the second is limited posteriorly by 

 the praebrachial vein ; the third spot is double, consisting of an oblique spot 

 which begins at the margin, just beyond the tip of the mediastinal vein, and 

 coalesces with a round spot at the tip of the petiole (origin of the fork); the 

 fourth spot is at the tip of the subcostal vein ; it is semi-oval and is enclosed 

 between the costa and the radial vein ; there are several subhyaline spots on 

 the surface of the wing ; a large angular one, beginning about the middle of 

 the anal area and reaching the posterior margin at the tip of the axillary vein ; 

 smaller ones in the anal angle of the wing, at the tip of the anal vein ; in the 

 pobrachial area (near the great crossvein) ; in the discal areolet; at the tip of 

 the wing, and on both sides of the fourih brown spot. A subhyaline longitu- 

 dinal streak crosses the second brown spot in the praebrachial area, and the 

 round spot at the tip of the petiole is encircled in pale. The mediastinal 

 veinlet is almost in one line with the tip of the mediastinal vein. 



California (Mr. Alex. Agassiz.) Single male. 



This species belongs to the group of L. cinctipes, solitaria and immatura, and 

 is most allied to the latter. Still it will be readily distinguished by its greater 

 size, the coloring of the feet and the wings, etc, 



[Sept. 



