20 STUTTGARTER BEITRAGE ZUR NATURKUNDE Ser. A, Nr. 622 
Name derivation: Named according to the light humeral part of elytra. 
Differential diagnosis: D. pallidihumeralis is very closely related to D. rubri- 
costatus which is very similar in the general appearance and the type of aedeagus, but 
it is distinguishable easily by the longer primary costa 3, the lighter humeri, the com- 
pletely black abdomen, and the shape of phallus. 
Description: d. Body medium sized, slightly widened posteriorly, brown, lat- 
eral and anterior margins of pronotum, elytral humeri, primary and partly sec- 
ondary costae, elytral suture, outer intercostal space and antennal segment 2 yellow 
to ligth brown. Head small, with hemispherically prominent but smaller eyes, inter- 
ocular distance 1.61 times longer than maximum eye diameter, antennal tubercles ap- 
parent, maxillary palpi more slender, apical segment nearly parallel sided, without 
tubercles at the outer margin, antennae serrate (Fig. 52). Pronotum transverse, 1.61 
times wider than long at midline, with only slightly elevated lateral margins and in- 
conspicuous tubercles at basal third, surface only slightly shining, with very fine mi- 
crostructure. Elytra with strong primary costae 2 and 4, rather shortened costa 3, 
secondary costae very weak, often interrupted, transverse costae irregular, reticulate 
cells variable, in average quadrate. Male genitalia robust, with a ventral process (Fig. 
32). 2: unknown. 
Measurements: Length of body 7.85 mm, width at humeri 1.90 mm, length of 
pronotum 0.97 mm, width of pronotum 1.56 mm. d: interocular distance 0.64 mm, 
maximum diameter of eyes 0.40 mm. 
Distribution: New Guinea, known from the type locality only. 
3.16. Diatrichalus parallelus sp. n. (Figs 38, 51) 
Type material: Holotype d. SE New Guinea, Iongai, 1700-1900 m, 9. XI. 1965, leg. J. 
SEDLACEK (BPBM). — Paratypes: d, New Guinea, Iongai, 10km E of Mt. Edward Albert, 
1450 m, 7. XI. 1965, J. SEDLACEK; — 6, New Guinea, NE, Wau, Morobe Distr., 1700 m, 7. II. 
1963, J. SEDLACEK; — 2 6 6, New Guinea, NE, Mt. Otto, 2200 m, 23. VI. 1955, J. L. GREssiTt 
(BPBM, LMBC). 
Name derivation: Named according to the slender, parallel-sided antennal segments. 
Differential diagnosis: D. parallelus difters from other metallic blue species 
of the genus by the shape of male antennal segments (Fig. 51) and in the male geni- 
talia (Fig. 38). 
Description: d. Body medium sized, slightly widened posteriorly, dark brown 
to black, with intensive metallic blue shine of elytra, pronotum and head. Head small, 
with apparent antennal tubercles, hemispherically prominent eyes, their interocular 
distance 1.15 times longer than maximum diameter, surface shining, sparsely pubes- 
cent, outer margin of maxillary palpi with several robust tubercles, antennae slender, 
slightly serrate, segments nearly parallel-sided. Pronotum tranverse, only slightly 
narrowed anteriorly, 1.52 times wider than long at midline, lateral tubercle unclear, 
disc shining, sparsely pubescent. Elytra with stout primary costae, costa 1 reaching 
one sixth of elytral length, costa 3 weaker apically, secondary costae very weak, some- 
times interrupted, mostly weaker than transverse costae, reticulate cells quadrate in 
average. Male genitalia considerably widened at apex (Fig. 38). 2: unknown. 
Measurements: Length of body 6.7mm, with at humeri 1.54mm, length of 
pronotum 0.69 mm, width of pronotum 1.20mm. ¢: interocular distance 0.50 mm, 
maximum eye diameter 0.43 mm. 
