1907.] NATURAL SCIENCES OF PHI1>ADEI.PHIA. 487 



vures and slender stifjnia. The cross veins toward the apex of the 

 elytra are marked with fuscous, the winj^s are milky hyaline with 

 brown nervures and are unclouded, and the intermediate carina of 

 the mesonotum are obsolete anteriorly in my specimeas. 



4. Oliarus hyalinns n. sp. 



Most closely related to humeralis Fowler. Mesonotum tricarinate; 

 elytra hyaline, with fuscous nervures, stigma, basal band and com- 

 missural nervure. Length 8 mm. 



Vertex long and narrow, about as in complcctus Ball; blackish 

 fuscous with fulvous carinse and a whitish line either side next the 

 inner margin of the eye. Front strongly widened below; dark castane- 

 ous with pale carinse and a pale area on either side next the clypeal 

 margin. Clypeus blackish fuscous with pale carina?. Pronotum very 

 short, linear, acutely emarginate behind almost to the anterior margin ; 

 soiled yellowish clouded with fuscous at the sid&s and under the eyes. 

 Tegulce pale clouded on their di.sks. Mesonotum dark eastaneous; 

 intermediate carinse obsolete or very feebly indicated anteriorly. 

 Elytra long and narrow^ clear hyaline with the nervures brown, under 

 a lens very obscurely and minutely punctate ; marginal and transverse 

 nervures heavier; stigma long and narrow, fascous, darker inwardly 

 and bounded by a whitish nervure anteriorly; base marked by a trans- 

 verse fuscous band across the apex of the scutellum which scarcely 

 attains the costal margin; claval suture pale; commissural nervure 

 fuscous, heavier for a space on the middle, then whitish to the apex of 

 the clavus. Beneath blackish fuscoas, paler on the meso- and meta- 

 pleura and edges of the abdominal segments. Legs brownish testace- 

 ous, darker on the femora. Ventral sinus of the male genital segment 

 deep, with a short median tooth; its sides obliquely rounded; plates 

 long, but little separated at base; expanded apical plate as long as the 

 slender base, roundedly triangular, inner edges approximate, grooved ; 

 pygofers just as long as the plates and concentric with them at their 

 rounded apex. 



Described from one male example taken by Mrs. Annie Trumbull 

 Slosson at Biscayne Bay, Florida. This species is somewhat anom- 

 alous in genus Oliarus by its narrow pellucid elytra, practically impunc- 

 tate nervures and tricarinate mesonotum, in all which characters it 

 agrees most closely with compleciiis Ball. It has however the short 

 pronotum, angularly emarginate hind margin of the vertex and frontal 

 ocellus of Oliarus, in which genus I now place it. It closely resembles 

 Fowler's figure of 0. humeralis (Biologia, pi. x, fig. 18), but the basal 

 band is narrower and the elytra are pellucid, not milky-hyaline, and 

 the nervures are fuscous. I believe it quite distinct. 



