BOCAK, REVISION OF DIATRICHALUS FROM NEW GUINEA 9 
Measurements: Length of body 8.7mm, width at humeri 2.03 mm, length of 
pronotum 0.98 mm, width of pronotum 1.59mm. d: interocular distance 0.65 mm, 
maximum diameter of eyes 0.41 mm. 
Distribution: New Guinea, Wamena valley. 
3.3. Diatrichalus biroi Kleine, 1943 (Fig. 25) 
Diatrichalus biroi Kleine, 1943 (KLEINE, 1943: 152). 
Type material: 2, “N. Guinea, Biro, 1900” (MTMB). 
Other material examined: d, “Milne Bay” (MHNP), designated as a holotype of 7. 
subarcuatithorax in Pıc’s collection; — 62, New Guinea, NE, Busu R., E of Lae, 100m, 
13.-14. IX. 1955, J. L. Gressrrt; — 6, New Guinea, NE, Wau Bulolo R., 850-900 m, 24. VII. 
1965, J. & M. SEDLACER; — d, Wau, 1200-1300 m, 1.-9. IX. 1965. J. SEpDLAcEK; — d, New 
Guinea, NE, Ambunti, Sepik R., 50m, 10. V. 1963, R. STRAATMAN; — 6, New Guinea, Neth., 
Ifar, 300-600 m, 20. VI. 1959, T. C. Maa (BPBM, LMBC). 
Differential diagnosis: D. biroi is the only species with missing secondary 
elytral cells and eyes larger than their interocular distance. 
Redescription: d. Body medium sized, slightly widened posteriorly, dark 
brown to black. Head small, with deep depression behind antennal tubercles, surface 
shining, covered with brownish pubescence, eyes large, hemispherically prominent, 
maximum eye diameter 1.07 times longer than interocular distance, maxillary palpi 
with apparent tubercles at outer margin, antennae serrate. Pronotum transverse, 1.50 
times wider than long at midline, with considerably elevated lateral margins, and less 
conspicuous lateral teeth, surface shining. Elytra with vestiges of secondary costae at 
humeri only, transverse cells dense, forming strongly transverse reticulate cells. Male 
genitalia with broad sclerotized internal sac (Fig. 25). 2. Interocular distance 1.22 
times longer than maximum eye diameter. 
Measurements: Length of body 8.15-10.10mm, width at humeri 
1.96-2.70 mm, holotype: length of pronotum 1.50 mm, width of pronotum 2.25 mm. 
2: interocular distance 0.67 mm, maximum diameter of eyes 0.55 mm. d: interocular 
distance 0.51 mm, maximum diameter of eyes 0.54 mm. 
Distribution: New Guinea, known mostly from lowland forests. 
Remark:There is one male bearing a hand written label “Trichalus subarcu- 
atithorax n. sp.” in Pıc’s collection in Paris. I have not found any description of this 
species in the literature, and therefore I consider this name as unpublished. 
3.4. Diatrichalus cerberus (Bourgeois, 1900) (Figs. 11, 15) 
Trichalus cerberus Bourgeois, 1900 (BouRGEOIs, 1900: 429). 
Diatrichalus cerberus (Bourgeois, 1900); KLEINE (1926: 167). 
= Trichalus completus Pic, 1923 (Pic, 1923: 36), hors-texte - syn. n. 
Type material: ö, holotype of D. cerberus, “N. Guinea, Andai, XII., Beccari 1875” 
(MSNG); — 2, paratype of D. cerberus, Dorey, WaLLACE (MHNP); - 2, lectotype of 
Trichalus completus (hereby designated), “Humboldt Bay, Nlle Guinée” (MHNP); - 2, para- 
lectotype (hereby designated), same data (MHNP). 
Other material examined: New Guinea: 6, NE, Bulolo, 700m, 6. XI. 1969, J. SED- 
LACEK;— 6 9, Wau 12. IX.; d, Wau 1100 m, 26. X. 1961; 6, ditto, 18. XII. 1961; — 6, Wau, 
1300-1500 m, 4. II. 1968; - d, Wau, Big Wau Ck., 1200 m, IX. 1963; - 5, NE, Kuper Ra, 
25km SE Salamaua, 25.-28. I. 1969; — 6, NE, Karimui, 1080 m, 14.-15. VII. 1963, J. SED- 
LACEK; — d Papua, Fly River, Kiunga 30 m, VII. 1969; -2 ¢ 36, NW, Nabire, S Geelvink Bay, 
