10 STUTTGARTER BEITRAGE ZUR NATURKUNDE Ser. A, Nr. 622 
5-50 m, 25. VIII.-7. IX. 1962, leg. J. SEDLACEK; 6, ditto, 2-9. VII. 1962, J. L. Gressrrr Coll. 
(BPBM, LMBC). 
Differential diagnosis: D. cerberus differs from other brownish black Dia- 
trichalus from New Guinea by the specific shape of the male genitalia (Figs 11, 15). 
Redescription: d. Body medium sized, parallel-sided, dark brown to black. 
Head small, with prominent antennal tubercles, eyes smaller, interocular distance 
1.38 times longer than the maximum eye diameter, surface of cranium mat, with fine 
microstructure, sparsely pubescent. Maxillary palpi robust, apical segment wide, 
with small tubercles at outer margin. Pronotum small, strongly transverse, 1.71 
times wider than long at midline, widest at base, lateral margins considerably elevat- 
ed, median areola wide. Elytra with four primary costae, costa | reaching one quar- 
ter of elytral length, remaining costae equal in strength, only costa 3 very slightly 
shortened, secondary costae present at humeri only, missing further, transverse 
costae very dense, consequently elytral cells strongly transverse. Male genitalia with 
laterally compressed phallus and stout ventral process (Figs 11, 15). 
Measurements: Length of body 7.6mm, width at humeri 2.12 mm, length of 
pronotum 0.90 mm, width of pronotum 1.54mm. d: interocular distance 0.59 mm, 
maximum diameter of eyes 0.43 mm. 
Distribution: Widespread on New Guinea. 
Remark: Based on the study of type material I propose Trichalus completus to be 
a junior subjective synonym of D. cerberus. 
3.5. Diatrichalus cyanescens (Bourgeois, 1900), comb. n. 
(Figs 7, 35-37, 43, 54) 
Trichalus cyanescens Bourgeois, 1900 (BouRGEOTs, 1900: 422). 
Type material: 2, holotype, “Isole, Aru, Wokan, O. BEccaArı 1873” (MSNG). 
Other material examined: New Guinea: 6, Neth., Kulima, 1400 m, 19.-22. II. 1960, T. 
C. Maa; — 6, Papua, Fly R., Kiunga, 35 m, VII. 1969, J. & M. SEpLAcEK Coll.; — &, SE, Mt. 
Lamington, 500m, VI. 1966, P. Shanahan; Papua, Owen Stanley Range, Goilala: Loloipa, 
1.-15. II. 1958, W. W. BRANDT; — 6, NE, Garaina, 800 m, 15. I. 1968; — &, W. Central Mts., 
Archibold Lake, 760 m, 26. XI.-3. XII. 1961, S. QuaTE; — 6, NE Wau, 1200-1500 m, 30. VIII. 
1965, J. SEDLACEK; — 6, Wau, 1200 m, 2. XI. 1969, M. SEDLACERK; — 6, Japan Island, SSE Sum- 
berbaba, Dawai R., 1. XI. 1962; - 2 ¢ 6, New Guinea NE, Goroka, 1550 m, 25. VI. 1955, leg. 
J. L. Gressrt; — 6, 19. VI. 1955; - 36, NE New Guinea: Kassem Pass, 1460 m, 18. VI. 1963, leg. 
J. SEDLACEK; — 6, Goroka-Kalebe, 1800 m, 24. VI. 1955, leg. J. L. Gressrrr; — d, Garaina, 
830 m, 13.-15. I. 1968, leg. J. & M. SEDLACER; — 6, Finisterre Ra, Saidor, Matoko Vill., 6.-24. 
IX. 1958, leg. W. W. BRANDT; - d, Kokoda, 28.-29. III. 1956, leg. J. L. Gressrrt; — &, Bulolo, 
750 m, 5. X. 1965, leg. J. SEDLACEK; — 6, 30kmS of Kainantu, 4. X. 1959, d, 1-10. V. 1963, 3 
9,22. IX. 1971, 8, 22. X. 1961, 8, X. 1968, 3b, 13. X. 1965; — bd, Wau, 1100-2200 m, 28. VI. 
1971, 8, 30. IX. 1965, leg. J. SEDLACEK; —2 d d, Wau, Kunai Ck, 1230 m, 28. V. 1965, leg. J. & 
M. SEDLACEK;— 6, Wau, Big Wau Ck, 1200 m, IX. 1965, leg. P. SHANAHAN; — 6, Bayer R., 20. 
VII. 1971, leg. J. SEDLACER; — d, Akvitana R., nr Aıyura, 1550 m, 10. I. 1965, J. L. Gressrrv; 
-3 dd, New Guinea NE, Goroka, 1550 m, 25. VI. 1955, leg. J. L. Gressrrt; — d, Mt. Missim, 
1600-2000 m, 21.-24. IX. 1964, leg. M. SEDLACER; — d, Watut R., X. 1969, 900-1300 m, leg. 
A. B. Mirza; - do, Wau, 1090 m, 25. I. 1963, leg. J. SEDLACER; — d, Wau, 1100-1200 m, 6. X. 
1965, 5, 19. IX. 1964, d 2,9. X. (BPBM, LMBC). 
Differential diagnosis: D. cyanescens differs from other Diatrichalus by the 
metallic shine of the elytra, in the eyes bigger than their interocular distance and the 
shape of the male genitalia (Figs 35-37). 
