S. Mahunka szerk.: Folia Entomologica Hungarica 32/2. (Budapest, 1979)

Abdomen as long as thorax. First tergite (Fig. 10) 1.5 times longer than wide, slightly but distinctly broadening posteriorly and rounded at its distal end; its surface antero-laterally uneven to rugulose, otherwise smooth, shiny. Further tergites polished. Hypopygium truncate, ovipositor sheath as long as second joint of hind tarsus (Fig. 11). Body black. Palps pale yellow, first joint entirely and second joint basally black. Tegula brownish yellow, mediaUy blackish. Legs yellow; coxae, first trochanter, second trochanter partly, middle femur proximally, and hind femur entirely black, hind femur with reddish suffusion. Last two joints of all tarsi fumous. Sternites 1-2 brown. Wings hyaline. Stigma blackish brown with a distinct basal yellow spot, rl and Cu2 with brown, further veins with yellow pigmentation. é and host unknown. Localities: 1. "Tunisia, Oued Esmara between Mahares-Gabes, 59 km S from Sfax, 10. IV. 1977 - No. 97, leg. S. Mahunka", 1 o (holotype).- 2. "Tunisia, Monastir, 16. IX. 19 77, No. 164, L. et S. Mahunka", 1 (j> (paratypes). - Holotype and female paratype deposited in the Hungarian Natural History Museum, Budapest; Hym. Typ. No. 2819 (holotype), 2820 (paratype). The new species stands nearest to M. coactus Lundbeck, 1897 (Greenland, Iceland), the specific differences between them are given in a tabular form: M. ariatus sp. n. 1. Head in dorsal view distinctly twice broader than long, behind eyes not broadening (Fig. 7). 2. Penultimate three joints of antenna oneand-a-half as long as broad (8-7:5,xl00). 3. Stigma rather wide, at most 2. 2 times longer than wide; metacarp short, distinctly shorter than half length of stig• ma (Fig. 9). 4. Hind leg relatively thin, hind femur 3. 5 times longer than broad, hind tarsal joints 2-4, 2.5-2 times longer than broad each as 13:5/10:4/8:4 (Fig. 8). 5. First tergite slightly widening posteriorly (Fig. 10). M. coactus Lundb. 1. Head in dorsal view at most 1.8-1.9 times broader than long, behind eyes, though weakly, broadening (Fig. 12). 2. Penultimate three joints of antenna cubic, their length equal with breadth. 3. Stigma less wide, thrice longer than wide; metacarp long, only one-quarter shorter than length of stigma (Fig. 13). 4. Hind femur relatively thick, hind femur thrice longer than broad, hind tarsal joints 2-4 at most twice longer than broad each as 12:6/8:5/7:4.5 (Fig. 14). 5. First tergite not widening posteriorly (Fig. 15). The new species is related to M. tunetensis Marshall, 1901 (Tunisia), M. aduncus (Ruthe, 1860) (Europe) and M. spectabilis (Haliday, 1834) (Palaearctic Region), however, they clearly differ from each other in several features: M. ariatus sp. n. 1. Stigma at most 2.2 times longer than wide, issuing radial vein from its middle. Dl only slightly wider than high (28:25-26, xlOO), dl relatively short, d2 five times longer than dl (Fig. 9) 2. First tergite slightly widening posteriorly (Fig. 10). 3. Hind tarsal joints 1-4 short, proportional length to width of each joint as 33:6/13:5/10:4/8:4 (Fig. 8). M. tunetensis Marsh. 1. Stigma 2. 5 times longer than wide, issuing radial vein distinctly from its distal half. Dl distinctly a quarter wider than high (33:25, xlOO), dl relatively long, d2 only 2. 5 times longer than dl (Fig. 17). 2. First tergite parallel-sided (Fig. 18). 3. Hind tarsal joints 1-4 long, proportional length to width of each joint as 37:6/18:5/14:4.5/11:4 (Fig. 16). *Lectotype seen through Dr. B. PETERSEN' s courtesy (Kpbenhavn). 18 0