BOCAK, REVISION OF DIATRICHALUS FROM NEW GUINEA 21 
Distribution: New Guinea, known only from mountains of the north eastern 
part of the island. 
3.17. Diatrichalus piper sp. n. (Fig. 20) 
Type material: Holotype d, New Guinea, NE, Karimui, 1080m, 8.-10. VII. 1963, J. 
SEDLACEK (BPBM). - Paratypes: 3 66, New Guinea, NE, Wau, 850-1500 m, 29. VII. 1961, 
24. VIII. 1965, VII. 1968; — 3, Papua, Bisuanumu, E of Port Moresby, 500 m, 8. VI. 1955, J. L. 
GressITT; — 6, New Guinea, NE, Karimui, 1080 m, 13. VII. 1963, J. SEDLACER; - 2 66, New 
Guinea, NW, Nabire, S. Geelvink Bay, 5-50 m, 1.-4. XII. 1962, 25. VIIL.-2. IX. 1962, J. SED- 
LACEK (BPBM, LMBC). 
Name derivation: One of paratypes was collected on piper and the specific name was 
derived from this information. 
Differential diagnosis: D. piper differs from similar species by the shape of 
the male genitalia (Fig. 20) and the size of eyes. 
Description: 3. Body small to medium sized, parallel-sided to slightly widened 
posteriorly, dark brown. Head small, antennal tubercles apparent, but rather flat, 
head sparsely lightly pubescent, shining, eyes large, hemispherically prominent, in- 
terocular distance 1.05 times longer than maximum eye diameter. Maxillary palpi ro- 
bust, with numerous, tiny tubercles at the outer margin, antennae acutely serrate, 
relatively slender. Pronotum transverse, 1.51 times wider than long at midline, later- 
al tubercle weak, disc lightly shining, with fine microstructure, sparsely pubescent. 
Elytra widest in apical fourth, primary costae equal in strength in most of their 
length, costa 3 shortened apically, secondary costae irregular, sometimes interrupted 
or weaker than transverse ones, reticulate cells irregular, mostly quadrate. Male gen- 
italia robust, nearly parallel-sided (Fig. 20). 2: unknown. 
Measurements: Length of body 6.05 mm, width at humeri 1.42 mm, length of 
pronotum 0.76mm, width of pronotum 1.14mm. d: interocular distance 0.44 mm, 
maximum diameter of eyes 0.42 mm. 
Distribution: New Guinea, not common but known from several localities 
scattered throughout the whole island. 
3.18. Diatrichalus proprius sp. n. (Figs 6, 19, 53) 
Type material: Holotype d, New Guinea NW, Wisselmeren, Itouda, Kamo Valley, 
1500 m, 15. VII. 1962, leg. J. SEDLACER (BPBM). 
Name derivation: It is named according to a remarkable structure in the middle of the 
aedeagus. 
Differential diagnosis: This specis differs from all known species by the 
shape of the aedeagus (Fig. 19). It is characteristic also in the form of pronotum, 
weak and larger, longer reticulate cells, but only the holotype is known and we can- 
not estimate the degree of variability. 
Description: d. Body medium sized, dark brown to black, with blue to green 
metallic shine especially on the elytra. Head small, eyes quite large, interocular dis- 
tance 1.06 times longer than maximum eye diameter, head surface shining, with ligth 
pubescence, maxillary palpi robust, with tiny tubercles at the outer margin of apical 
segment, antennae scarcely serrate (Fig. 53). Maxillary palpi stout and long. Prono- 
tum flat, slightly transverse, 1.39 times wider than long at midline, moderately nar- 
