BOCAK, REVISION OF DIATRICHALUS FROM NEW GUINEA 23 
2500-2600 m, 31. V. 1963, J. SEDLACEK; — ?, Mt. Hagen, 3400 m, 6. VI. 1966, J. L. GressiTT; — 
2 22, Mt. Michael, summit, 3605 m, 22. VI. 1967, G. A. SAMUELSON; — 2 dd 2 @ 2, ITalibu, 
2800 m, GressttT-Maa (BPBM, LMBC). 
Name derivation: Named according to the very characteristic coloration of elytral 
costae. 
Differential diagnosis: D. rubricostatus is very characteristic in general ap- 
pearance (Fig. 1) and colour pattern. The only relative and partly similar species is D. 
pallidihumeralis, which differs by coloration and shape of the phallus. D. rubri- 
costatus is the only known Diatrichalus, which has ligth apical part of abdomen re- 
sembling light producing Lampyridae. 
Description: d. Body medium sized, slightly widened posteriorly, black, later- 
al margins of pronotum orange yellow, suture, primary costae, except short humer- 
al part, and outer margin of the elytra reddish brown and covered with dense reddish 
pubescence; visible sternites 6-8 light brown, the rest of abdomen black. Head 
small, antennal tubercles rather small, apparently separated from the inner margin of 
the eyes, surface shining, densely pubescent, eyes small, interocular distance 1.93 
times longer than maximum eye diameter, palpi robust, outer margin of apical seg- 
ment with several light tubercles, basal antennal segments nearly parallel-sided (Fig. 
46). Pronotum transverse, 1.64 times wider than long at midline, shining in black 
part, rugulose in reddish one, whole disc densely pubescent. Elytra only with costae 
2 and 4 developed in whole length and often joining each other before apex, costa 1 
reaching one tenth of elytral length, costa 3 half to two thirds of elytra length, trans- 
verse costae well developed but irregular, secondary costae mostly weaker, often in- 
terrupted or missing in longer intervals, then secondary costae either freely ending 
in middle of intercostal interval or forming step-like pattern with near opposite 
transverse costa. Male genitalia slender, apparently widened in apical part (Fig. 31). 
Measurements: Length of body 8.0mm, width at humeri 2.12 mm, length of 
pronotum 1.09mm, width of pronotum 1.79mm. d: interocular distance 0.59mm, 
maximum diameter of eyes 0.31 mm. 
Distribution: New Guinea, known from highest elevations of New Guinean 
mountains, most specimens were collected in elevations above 3300 m a.s.l., one 
specimen was collected even in the grass habitat of alpine zone around 4000 m a.s.l. 
3.20. Diatrichalus schawalleri sp. n. (Fig. 26) 
Type material: Holotype 6, Irian Jaya, Manokwari, Ransiki, Mayuby/Benyas, 27.-28. 
VIII. 1990, leg. A. Rıeper (SMNS). 
Name derivation: D. schawalleri is named in honour of Dr. W. SCHAWALLER (Stuttgart). 
Differential diagnosis: The eyes larger than interocular distance distinguish 
D. schawalleri from most uniformly dark New Guinean species of the genus. Simi- 
lar size of eyes was found in D. tenimberensis, which differs by the type of the aedea- 
gus (Fig. 26). 
Description: d. Body medium sized, slightly widened posteriorly, dark brown 
to black. Head small, with well marked antennal tubercles, eyes large, hemispheri- 
cally prominent, maximum eye diameter 1.09 times larger than interocular distance, 
maxillary palpi robust with tiny tubercles, head shining, covered with short pubes- 
cence, antennae acutely serrate. Pronotum transverse, 1.68 times wider than long at 
