BOCAK, REVISION OF DIATRICHALUS FROM NEW GUINEA 2% 
Distribution: New Guinea, Biak I., Normanby I., New Britain, Tenimber L., 
very widely distributed species. 
3.26. Diatrichalus wauensis sp.n. (Fig. 17) 
Type material: Holotype d, New Guinea: (NE) Wau, Morobe Distr. 1300 m, 22. XII. 
1961, J. & J. H. SEDLACER Collectors Bishop. — Paratype ?, West New Guinea, Star Mts., Sibil 
Val. 1245 m, 18. X.-8. XI. 1961, S. QuaTE & L. QuaTE (BPBM). 
Name derivation: The species is named after the holotype locality data. 
Differential diagnosis: D. wauensis differs externally from other species with 
missing secondary costae in the lighter margins of pronotum and in the characteris- 
tic slender phallus (Fig. 17). 
Description: d. Body small to medium sized, slightly dilated posteriorly, dark 
brown to black, only lateral margins of pronotum light brown. Head small, antennal 
tubercles present, surface shining, eyes rather smaller, interocular distance 1.27 times 
longer than maximum eye diameter, maxillary palpi with robust tubercles, antennae 
serrate, Pronotum transverse, 1.61 times wider than long at midline, without lateral 
tubercle, median areola connected with anterior margin through short keel, frontal 
angles apparent, basal margin nearly straight. Elytra with secondary costae missing, 
primary costa 1 reaching one quarter of elytral length, costa 3 nearly as long as re- 
maining ones. Male genitalia with slender phallus (Fig. 17). 
Measurements: Length of body 6.85 mm, width at humeri 1.69mm, length of 
pronotum 0.78 mm, width of pronotum 1.25mm. d: interocular distance 0.52 mm, 
maximum diameter of eyes 0.41 mm. 
Distribution: New Guinea, only two specimens were collected in very distant 
localities on the island. 
3.27. Diatrichalus xylobanoides Kleine, 1926 (Figs 5, 23-24, 47) 
Diatrichalus xylobanoides Kleine, 1926 (KLEINE, 1926: 167). 
Type material: Holotype d, “D. N. Guinea, 285, Hunsteinspitze, 3. III. 1943, Kais. Au- 
gustafl. Exp., BUrGERs S. G.” (NHMB). 
Differential diagnosis: D. xylobanoides is characteristic externally in the 
completely dark brown body, small eyes in male and completely missing secondary 
longitudinal costae on the elytra; the slender phallus without ventral process has not 
been found in any other Diatrichalus species (Figs 23-24). 
Redescription: d. Body medium sized, dark brown to black, head small, sur- 
face shining, covered with short, lighter pubescence, antennal tubercles less promi- 
nent, depression behind them shallow, eyes smaller, interocular distance 1.56 times 
longer than the maximum eye diameter, antennae serrate (Fig. 47). Pronotum flat, 
1.45 times wider than long at midline, surface shining (Fig. 5). Elytra with stout pri- 
mary costae, secondary costae missing, transverse costae seldom y-shaped, not very 
dense, but reticulate cells never quadrate. Male genitalia slender, without ventral 
process (Figs 23-24). 
Measurements: Length of body 7.0mm, width at humeri 1.85 mm, length of 
pronotum 0.92 mm, width of pronotum 1.33 mm. d: interocular distance 0.35 mm, 
maximum diameter of eyes 0.55 mm. 
Distribution: New Guinea. 
