254 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



44-. Aricia oregonensis Malloch, new species 



Male : Black, slightly shining, densely gray pruinesccnt. Head black, 

 frons, orbits, face, and cheeks with silvery pruinescence, second antennal 

 joint reddish at apex, palpi black; mesonotuna very indistinctly quadrivit- 

 tate; basal dorsal abdominal segment (second) with a pair of black spots, 

 segments two and three each with a pair of black rectangular spots which 

 extend from base to apex of segments. Legs black, apices of fore femora, 

 apical third of mid- femora, most of hind femora and all tibiae rufous-yellow. 

 Wings clear; ci'oss-veins very slightly infuscated ; calyptra white; halteres 

 yellow. 



Eyes bare, separated at narrowest part of frons by about as great a 

 distance as width across posterior ocelli; orbits bristled more than midway 

 to_ anterior ocellus; interfrontalia distinct; parafacial in profile as wide as 

 third antennal joint; antenna; not as long as face, third joint twice as long 

 as second; arista with rather dense short hairs, the longest barely longer 

 than basal diameter of arista ; cheek about twice as high as width of para- 

 facial ; face slightly concave above vibrissa ; thorax without strong pre- 

 sutural acrostichals ; three pairs of postsutural dorsocentrals present; 

 prealar bristle minute ; sternopleurals 1 :2, with a weak bristle below and 

 behind the anterior one; hypopleura bare. Abdomen elongate-ovate, third 

 and fourth dorsal segments with strong discal and posterior marginal 

 bristles ; fifth sternite with dense short stiff hairs on its entire surface, the 

 posterior margin with a broad shallow excision ; fore tibia without median 

 bristles ; mid tibia with from two to four posterior bristles ; hind femur 

 with about eight long strong bristles on apical half or apical third of pos- 

 tero-ventral surface ; hind tibia with one or two antero-dorsal bristles, the 

 antero-ventral, ventral, and postero-ventral surfaces with rather dense 

 erect hairs of moderate length. Costal thorn short; veins three and four 

 parallel apically ; outer cross-vein bent in middle. 



Length, 7 mm. 



Type, Grant Co., Ore., one male. 



45. Coenosia oregonensis Malloch, new species 



Male: Black, slightly shining, covered with dense pale gray pruinescense. 

 Head black, interfrontalia darker than the densely gray pruinescent orbits ; 

 antennse black, third joint entirely pale yellow; arista black; palpi pale 

 yellow; proboscis blackish brown; dorsum of thorax not vittate, very 

 noticeably shining and rather thinly pruinescent (possibly abraded). Ab- 

 domen with a conspicuous pair of large brownish black spots on segments 

 two, three, and four, the basal (first distinct) segment without spots ; fifth 

 sternite gray. Legs pale yellowish testaceous, mid and hind coxje, and all 

 tarsi infuscated ; wings clear, veins black ; calyptra white : halteres yellow. 



Frons one-third as wide as head ; orbits narrow, each with three long and 

 one short bristle ; ocellar bristles distinctly longer than upper orbitals and 

 very much longer than postvertical pair ; antennae extending over two-thirds 

 of the distance to mouth-margin, third joint not over twice as long as 

 second, rounded at apex; arista almost bare, slightly swollen for a short 

 distance at base; parafacial in profile narrower than third antennal joint; 

 cheek about one-sixth as high as eye, with about three long marginal 

 bristles ; vibrissa long and strong, a short setula above it. Dorso-central 

 bristles long and strong; presutural acrostichals irregularly two-rowed; 

 lower spiracular bristle distinct, directed ventrad ; abdomen normal in form' 

 the tergites subequal, fifth but little exposed when viewed from above; 



