Dr. Murai Éva szerk.: Parasitologia Hungarica 25. (Budapest, 1992)

branches single, internal bifurcated secondarily. Medial surface of bursa near ventral and lateral rays covered with small spine-like structures. Spicules equal, 124-153 (av. 132, n=

10) long, with dense proximal end and not divided pointed distal tip (Fig. 3G). Gubernaculum 46-48 (av. 47, n=6) long. Genital cone simple, with two papillae. Female: Body length 3.20-3.44 mm (av. 3.37 mm, n=9). Width at anterior end 11.5-12.5 (av. 12, n=6), maximum width 63-72 (av. 70, n=9). Cephalic vesicle measuring 22-30 x 17-22 (av. 24x20, n=5). Oesophagus 192-228 (av. 205, n=9) long. Nerve ring, excretory pore and deirids at 101-110 (av. 104, n=6), 125-130 (av. 126, n=5),and 130-139 (av. 134, n=5), respectively, from anterior end (Fig. 3A). Vulva situated at 620-740 (av. 669, n=8) from posterior end. Vagina short, continues into short ovejector. Total length of ovejectors with sphincters 120-160 (av. 130, n=6) (Fig. 3E). Tail conical, 40-51 (av. 44.16, n=6) long, ending with 4 spines - one thin, 12-17 (av. 14, n=7) long, and 3 shorter and thicker, 7-10 (av. 8, n=8) long (Fig. 3D). Eggs measuring 60-81 x 27-35 (av. 71-36, n=6). Molinostrongylus vespertilionis Morosov and Spassky, 1961 There is only one male specimen from this species available in the Collection and therefore the description is partial. Host: Pipistrellus pipistrellus Schreb. Location: small intestine. Distribution in Bulgaria: Sofia region (Soukhata Peshtera cave near Lakatnik). Redescription (based on 1 male specimen from P. pipistrellus from Lakatnik): Straight body. Cephalic end apically with two amphids, 6 labial and 4 cephalic papillae (Fig. 4B). Synlophe: Wide rounded lateral alae along whole body. They appear behind cephalic vesicle and extend to level anteriorly to caudal bursa. In transverse section these alae appear as slightly protruding lateral appendices (bands); internal canal presents in them behind oesophagus (Figs. 4F, G, H, I, J). Ventral and dorsal ridges lacking. Male: Comparatively big nematode with pronounced transverse striation of cuticle. Body length 6.048 mm, width at anterior end 35, maximum width 129. Cephalic vesicle symmetrical, measuring 53 x 32. Oesophagus length 263, maximum width 38. Nerve ring situated at 139 from anterior end. Deirids situated at one level, behind oesophagus, at 267 from anterior end (Fig. 4A). Two prebursal papillae. Bursa 145 long and 290 wide. Small chitin spines irregularly situated on medial side of membrane of lateral lobes. Dorsal ray 104 long, extending almost to end of bursa, branched in its posterior third into four; external branches not divided, internal divided at their end. Genital cone simple, rounded (Fig. 4C). Spicules equal, 245 long and 12 wide at proximal end. Spicules with transversely striated wide lateral alae on medial side. Spicules distally divided into three parts: one long pointed and two short, very thin and pointed (Fig. 4D). Gubernaculum tapering at anterior end, measuring 88 x 17 (Fig. 4E). Discussion: This is the first record ofM. vespertilionis in Bulgaria. It differs from the other three species in its morphometrical characteristics, as follows: in its dimen-