BOCAK, REVISION OF DIATRICHALUS FROM NEW GUINEA 11 
Redescription: d. Body medium sized, robust, parallel-sided, dark brown to 
black, elytra and slightly also pronotum with blue shine. Head small, with apparent 
antennal tubercles, their surface shining but very finely punctuated (visible at 90x 
magnification), sparsely pubescent, eyes big, hemispherically prominent, maximum 
eye diameter 1.02 times longer than interocular distance. Antennae serrate, maxillary 
palpi robust, apical segment with numerous tubercles at the outer margin. Pronotum 
small, widest at base, strongly transverse, 1.60 times wider than long at midline, pos- 
terior angles rectangular, with shortly projected distal part, lateral margins without 
lateral projections, frontal margins widely rounded, median areola wide (Fig. 7). 
Elytra flat, with primary costa 1 reaching one fifth of elytral length, costa 3 only 
slightly weaker in the apical part, secondary costae much weaker, even slightly 
weaker than transverse costae, transverse costae dense, elytral cells in average slight- 
ly wider than long. Male genitalia as in figs 35-37. 
Measurements: Length of body 6.8-9.8 mm, width at humeri 1.50-2.15 mm, 
length of pronotum 0.92-0.97 mm, width of pronotum 1.62-1.68 mm. ¢: interocu- 
lar distance 0.53 mm, maximum diameter of eyes 0.52 mm. 
Variability: D. cyanescens is variable in many characters by the shape of anten- 
nae, pronotum and male genitalia (Figs 35-37). Although the examined series from 
different localities were quite extensive I have not found any population charac- 
terised at least by some minute character and there are many transition states be- 
tween extreme expression of all above mentioned characters. Therefore I consider 
here all specimens as members of one species. 
Distribution: Widespread species, common on New Guinea, Aru and Japan Is- 
lands. 
3.6. Diatrichalus dentatus (Kleine, 1926), comb. n. (Fig 21, 50) 
Trichalus dentatus Kleine, 1926 (KLEINE, 1926: 170). 
Type material: ?, type, “Z. Nieuw. Guinea, Lorentz 1909-10, Bivak Eiland I. 10” 
(ZMAN). 
Other material examined: 3 dd, New Guinea NW, Wisselmeren, Moanemani, Kamo 
V., 1500 m, 13. VII. 1962, leg. J. SEDLACER; — d, Wisselmeren, Enarotali, 1750-1900 m, 12. 
VIII. 1962, &, 28. VII. 1962, &, 5. VIII. 1956, 5, 16. VII. 1962; -2 8 d, Kamo Debei div., 
1700 m, 13. VIII. 1962, leg. J. SepLAcEK; — d, Obano, 1770 m, 9. VIII. 1955, leg. J. L. Gres- 
sITT; — 6, Itouda, Kamo V., 1500 m, 17. VIII. 1962; — 5, Enarotali (without other data); - 6, 
NE Feramin, leg. W. W. BRANDT, 1.-6. VI. 1959, 3, 23.-31. V. 1959; -2 3d, Karimui, 1080 m, 
14.-15. VII. 1963, leg. J. SEDLACER; — 6, Kokoda, 28.-29. III. 1956, leg. J. L. Gressrrt; - 6, 
Finisterre Ra, Saindor, Kiambavi Vill., 22.-29. III. 1958, leg. W. W. BRANDT; — 6, Eliptamin 
Valley, 1200-1500 m, 1.-15. VII. 1959, leg. W. W. Branpt; — 6, Mindik, 1200-1600 m, IX. 
1968, leg. N. L. H. Kraus (BPBM, LMBC); - 6, Irian Jaya, Baliemtal, Jiwika, 1700-2300 m, 
1.-2. IX. 1990, leg. A. RrepEL; — & 9, Irian Jaya, Wamena, Kangime, 1200-2200 m, 4. IX. 
1900, leg. A. RIEDEL; — 2, Irian Jaya, Manokwari, Ransiki Mayuby/Banyas, 27.-28. IX. 1990, 
leg. A. Rıeper (SMNS). 
Differential diagnosis: It differs from other species by dark brown body and 
blue metallic shine and in having small eyes. It is very near by general appearance to 
D. cyanescens from which it differs additionally by the eyes size in the presence of a 
projection at basal third of lateral pronotal margin and more acutely projected 
pronotal hind angles. 
Redescription: d. Body medium sized, slightly widened posteriorly, dark 
brown to black, with blue or green metallic shine especially on the elytra. Head 
