14 STUTTGARTER BEITRAGE ZUR NATURKUNDE Ser. A, Nr. 622 
flat, followed by deep transverse depression, head surface lightly shining, with fine 
microstructure, densely covered with black pubescence, maxillary palpi robust, with 
numerous, tiny tubercles at the apical margin, antennae slender, serrate. Pronotum 
transverse. 1.5 times wider than long at midline, with only lightly elevated lateral 
margins, shining, covered with dense, short, black pubescence. Elytra with primary 
costae 2-4 stout, costa 3 only slightly shorter and weaker in apical part, secondary 
costae very weak to missing in some intercostal intervals. Transverse costae very ir- 
regular, often forming Y-shaped patterns when connecting near the opposite costae, 
reticulate cells irregular in shape. Male genitalia rather slender, slightly constricted in 
middle (Figs 41, 42) 
Measurements: Length of body 9.3mm, width at humeri 2.06 mm, length of 
pronotum 1.00 mm, width of pronotum 1.51 mm. ¢: interocular distance 0.61 mm, 
maximum diameter of eyes 0.61 mm. 
Distribution: New Guinea, widespread but not common species. 
3.8. Diatrichalus emarginatus sp. n. (Figs 33, 45) 
Type material: Holotype d, New Guinea: NE, Feramin, 150-120m, 23.-31. V. 1959, 
leg. W. W. Branpt (BPBM). - Paratypes: 3 dd, 1 2, same data as holotype (BPBM, LMBC). 
Name derivation: This species is named according to the deeply emarginate basal part 
of the sclerotized structure of internal sac. 
Differential diagnosis: D. emarginatus differs from other blue metallic 
species by the shape of the aedeagus (Fig. 33), absence of secondary elytral costae in 
most of the elytra and the size of male eyes. 
Description: d. Body small, slightly widened posteriorly, dark brown to black, 
elytra with apparent metallic blue shine. Head small, with prominent antennal tu- 
bercles followed by deep transverse depression, surface of cranium shining, covered 
with sparse pubescence, eyes hemispherically prominent, interocular distance 1.29 
times longer than maximum eye diameter, apical segment of maxillary palpi with 
tiny, numerous tubercles, antennae slender, individual segments nearly parallel-sided 
(Fig. 45). Pronotum transverse, 1.67 times wider than long at midline, with acutely 
projected hind margins and well marked anterior ones, projections at lateral margins 
apparent. Elytra with primary costa 1 reaching one fifth of elytral length, costa 3 
shortened and weaker in apical quarter, secondary costae present at humeri only, 
elytral cells are apparently transverse. Male genitalia with very wide and emerginate 
plate in the apical part of the male genitalia (Fig. 33). 
Measurements: Length of body 6.10 mm, width at humeri 1.45 mm, length of 
pronotum 0.67 mm, width of pronotum 1.12mm. d: interocular distance 0.44 mm, 
maximum diameter of eyes 0.34 mm. 
Distribution: New Guinea, known from the type locality only. 
3.9. Diatrichalus fasciatus sp. n. (Figs 4, 29) 
Type material: Holotype d, Irian Jaya: Baliem Pass, 1900 m, 15.-16. IX. 1990, leg. A. 
RIEDEL (SMNS). 
Name derivation: Named according to the light transverse bands on the elytra. 
Differential diagnosis: D. fasciatus is the only species in this genus with two 
ligth bands on the elytra. It resembles by the size of male eyes and in general ap- 
