72 Psyche [April 



prominent; face grayish above the prominent suture, shining green below it; palpi 

 large, yellow in ground color, with snow-white shining luster on the outer side, 

 which has only a few hairs, of a yellowish-brown color, mostly along the upper or 

 front edge; eyes prominent and rounded, extending much below the side of the 

 face, but not much below the pointed middle of the face; antennae wholly blackish, 

 as described under the generic characters. Thorax pure bright green above, not 

 very shining, with two narrow brown lines extending from the front almost to the 

 scutellum, close together, also a long and rather wide brown spot on each side, 

 extending about equally before and behind the suture; humeri and a stripe above the 

 notopleural suture pruinose with whitish; pleura wholly covered with a thin green- 

 ish-gray pruinosity, which also covers the metapleura; propleura with a brownish 

 bristle and one or two hairs; squama brownish, with yellowish hairs; halteres 

 yellow. Coxa; and legs blackish, with little greenish luster, the tips of coxae, the 

 trochanters and extreme base of femora yellow, tips of femora and bases of tibiae 

 also yellow; front coxae with thin white hair on front side and a few black bristles 

 at tip; all the femora quite destitute of bristles except a preapical one on the 

 middle and hind ones; tibiae plain, with ordinary bristles; tarsi plain, with small 

 pulvilli and empodia. Wings uniformly infuscated, the veins dark. Abdomen 

 short, grayish-green, not shining, with black hairs, which attain the size of bristles 

 only along the hind edge of the first segment, especially toward the sides; hypopy- 

 gium with two black lamellae hanging down from posterior part. Length, 4 mm.; 

 of wing, 5 mm. 



Female. Face wider, not very shining, rather grayish-brown below the suture, 

 the palpi more pointed than in the male, covered with coarse black hair and grayish 

 pollen, which is paler along the lower edge. The postsutural bristles are uniformly 

 larger than in the male, always two on each side. Length, 4.9 mm.; of wing, 

 6.1 mm. 



Three males and three females, collected by myself near Olga, 

 Orcas Id., Wash., July 14, 1909. One male, collected by Professor 

 Melander near the same place, July 28, 1909. 



All the specimens were taken on rocks along a little brook in 

 a very shady place. 



The wholly yellow legs of prasinus, among other characters, 

 easily distinguish it from olga. 



EXPLANATION OF PLATE. 



Fig. 1. Hydrophorus cerutias Loew, wing of male. 



2. " phoca sp. nov. wing of male. 



3. " parvus Loew, wing. 



4. " intentus sp. nov. back of head, showing supernumerary 



postvertical bristles. 



5. " cerutias Loew, side of head of male. 



6. " magdelencB Wheeler, side of head showing wide cheek. 



7. " pensus sp. nov. abdomen and hind femur of male. 



