BOCAK, REVISION OF DIATRICHALUS FROM NEW GUINEA 18) 
gin conspicuous. Elytra with both primary and secondary costae, costa 1 reaching 
basal fifth only, costa 3 slightly shortened, secondary costae very weak, sometimes 
weaker than transverse costae, elytral cells quadrate to slightly transverse. Male gen- 
italia robust, phallus approximately parallel-sided (Fig. 21). 2: interocular distance 
1.59 times longer than maximum eye diameter, antennae robust, serrate. 
Measurements: Length of body 6.3-9.0mm, width at humeri 1.5-2.0 mm, 
length of pronotum 0.93 mm, width of pronotum 1.43 mm. ¢: interocular distance 
0.65 mm, maximum diameter of eyes 0.45 mm. 
Distribution: D. dentatus is widespread on New Guinea and it is one of the 
commonest Diatrichalus species in the area. According to the locality data this 
species occurs preferably in the elevations 1000-2000 m above sea level. 
Variability: D. dentatus is variable by the colour of the metallic shine, the de- 
gree of expression of lateral projections of the pronotum and in the shape of the ely- 
tra. 
Remarks: The holotype is a female and it is difficult to connect this specimen 
with series collected later. Although KLEINE (1926) based his description of D. den- 
tatus exclusively on the shape of the pronotum, this specimen has a damaged prono- 
tum. Nevertheless, it is apparent that posterior angles are considerably prominent 
and that there was a projection present in basal part of lateral margins. The holotype 
has transverse costae irregular but dense and therefore elytral cells are apparently 
transverse. I have only one specimen in the available material which has similarly 
transverse reticulate cells, other specimens expressing less dense arrangement of 
transverse costae. The more projected posterior angles, although not so considerable 
as in the holotype, and the presence of lateral projection are generally present in the 
series assigned here to D. dentatus. Based on the given similarity I have identified the 
series of blue Diatrichalus with smaller male eyes and male genitalia as in Fig. 21 as 
D. dentatus. 
3.7. Diatrichalus dilatatus sp. n. (Figs 41-42) 
Type material: Holotype d, Irian Jaya, PNG, Wau, Mt. Kaindi, 1650 m, 7. X. 1992, leg. 
A. RiepEL (SMNS). - Paratypes: d, New Guinea, NE, W Highlands, Yaibos, 2150-2200 m, 
10. VI. 1963; - 6 New Guinea, NE, Wau, I. 1970, J. SEDLACER; — 6, 24-32km SE Wau, 
1500-1900 m, 20. III. 1962, J. SEDLACER; — 6, Morobe distr., Saureli-Arabuka, 1500-1800 m, 
6. I. 1968, J. SEDLACEK; — d, Mt. Hagen area, 1650 m, 27. VI. 1957, D. ELmo HARDY; - d, Ion- 
gai, 10km E of Mt. Albert Edward, 1450-1800m, 8.-10. XI. 1965; - d, Kepilam, 
2420-2540 m, 21. VI. 1963;—2 636, New Guinea SE, Mt. Giluwe, 2500 m, 6. VI. 1963 (BPBM, 
LMBC); - 2 88 2 22, Irıan Jaya: Prov. Jayawıjaya, Djuremma, 9.-11. IX. 1992, 
1900-2100 m, leg. A. RiEDEL; — 6, Irian Jaya, Jayawıjaya, Ejpomek, 1800-2300 m, 5. IX. 1992, 
leg. A. RıEDEL; — d, Irian Jaya, Jayawijaya, N Bime, 2000-2070m, 21. IX. 1993, leg. A. 
RıepeL (SMNS, LMBC). 
Name derivation: This species is named according to the posteriorly widened elytra. 
Differential diagnosis: It differs from other species by metallic shine, by the 
shape of male genitalia and posteriorly widened elytra. It differs externally similar 
D. metallicus substantially in the shape of the male genitalia. 
Description: d. Body medium sized, apparently widened posteriorly, elytra 
widest in the apical third to quarter of their length, black, dorsally with intensive, 
metallic shine. Head small, with large, hemispherically prominent eyes, interocular 
distance as long as maximum eye diameter, antennal tubercles well developed, rather 
