New Trechine Beetles 1 25 



cerberus, differing in presence of both pairs of elytral discal setae (+++) 

 and longer and straighter aedeagus (length 1.15-1.43, mean 1.30 ± 0.90 

 mm) with slightly reflexed tip (as in Fig. 7). 



Type series. — Holotype male (American Museum of Natural His- 

 tory) and 11 paratypes, Cole Cave, 1.8 km N Austin, Barren Co., Ken- 

 tucky (Austin iy 2 ' Quadrangle), 12 February 1966, T. C. Barr; 11 addi- 

 tional paratypes, same cave, 13 April 1973, R. Pape. Measurements of 

 holotype (mm): total length 5.52, head 0.87 long X 0.81 wide, pronotum 

 0.87 long X 1.02 wide, elytra 2.76 long X 1.67 wide, antenna 3.66. 



Distribution. — Described on 33 specimens, all from central Barren 

 County, Kentucky: Cole, Beckton, Bryant Edmonds, Geralds, Mitchell, 

 Hansons, and Slick Rock caves. Hybridization with nominate cerberus 

 occurs in Bowles Branch Cave, 8.4 km southeast of Glasgow. Ranges of 

 P. m. campestris and P. c. completus are almost parapatric, rare exam- 

 ples of the latter having been collected in Beckton and Hansons caves, 

 where P. m. campestris is more abundant. This taxon coexists with P. 

 striatus (hind angles produced; elytra not pruinose), P. pubescens (api- 

 cal groove well developed), and Neaphaenops tellkampfi. 



Pseudanophthalmus darlingtoni darlingtoni, new species and subspecies 



Fig. 8 



Etymology. — Patronymic honoring the late Philip J. Darlington, Jr. 



Diagnosis. — A large species of the menetriesi group with shallow, 

 impunctate striae, convex elytra with normal chaetotaxy (+++), disc 

 weakly pruinose overall; pronotum with 1-2 long setae each side of disc 

 and hind angles produced backward as in P. striatus. 



Description.— Length 4.9-6.3, mean 5.7 ±0.3 mm (N = 207). Robust, 

 convex, pubescent. Head about 0.14 (mean index) longer than wide, 

 dorsum subglabrous; labrum with small median lobe. Pronotum about 

 0.85 (mean) as long as wide, transverse-cordiform, widest in apical 

 fourth; anterior angles scarcely produced; sides rounded apical 0.4 then 

 convergent with very shallow or no sinuation to hind angles, which are 

 small, sharp, and slightly obtuse; base with small, rounded, secondary 

 angles, not obliquely inclined forward at sides (thus differing from 

 menetriesi and cerberus); disc with scattered, rather long pubescence 

 and 1-2 long setae each side; apex as wide as base and two-thirds great- 

 est width. Elytra oblong-oval, very convex with deplanate circumscutel- 

 lar area, 1.56 ± .04 times longer than wide (range 1.40-1.60), widest 

 behind middle and with posthumeral marginal sinuation (as in striatus 

 but deeper), humeri very prominent, prehumeral borders not quite per- 

 pendicular to mid-line, humeral serrations very coarse; disc microsculp- 

 ture finely transverse, forming tight meshworks, disc with weak prui- 

 nose microsculpture over entire surface; longitudinal striae moderately 

 and evenly impressed, rather shallow, intervals subconvex to nearly flat, 



