part 1 garth: pacific oxyrhyncha 177 



margins arcuate. Supraocular eave expanded posteriorly to override a 

 corresponding hepatic projection, the two forming a button-hole slit and 

 concealing all but the cornea when viewed from above. A large setose 

 tubercle located on the lateral margin just in advance of, another just 

 posterior to the small sharp tubercle terminating the diagonal ridge. 

 Gastric region high, surmounted by a large median tubercle with a pair 

 of smaller tubercles in advance of it; cardiac region with three small 

 tubercles arranged in a backward-pointing triangle. Hooked hairs present 

 in a double row on each rostral horn, sparsely on each preorbital horn, in 

 a rectangle of four clusters outlining the gastric region, and fringing the 

 posterior medallion. Posterior margin lamellate, crenulate, not bilobed. 



Basal antennal article broad, bearing a ridge internally and a small 

 spine at anteroexternal angle. First free antennal segment cylindrical, 

 twice as long as second, second barely reaching end of rostrum, the two 

 segments fringed with coarse hair ; flagellum slender. Orbit entirely open 

 beneath, the fringing hairs of the hepatic projection affording a minimum 

 of concealment to the retracted eye. 



Outer maxilliped smooth and inflated, hooked projection of exognath 

 lodged in a basal groove of the ischium, completely filling it; merus in- 

 serting deeply into outer border of ischium, anteroexternal angle pro- 

 duced into a thin blade, anterointernal margin cut into three distinct 

 lobes; first article of three-segmented palp subquadrate. 



5. Tyche clarionensis (Velero III Sta. 303-34), right outer maxilliped, x 12. 



Cheliped of male more robust than walking legs; merus cylindrical, 

 an outer proximal tubercle; carpus with a tubercle above; manus supe- 

 riorly compressed, moderately inflated, scarcely tapering distally, palm 

 nearly bare ; fingers closing with a narrow gape and provided with numer- 

 ous denticles, tips pointed, crossing. 



