1980] 
Eickwort — Chelostoma 
317 
Propodeum sloping to posterior surface, without distinct, 
horizontal, basal zone; form robust to slender, shortest dis¬ 
tance between tegulae greater than length of mesoscutum 
.15 
14 (13). Labial palp with 2 free segments; female with clypeus 
emarginate apically and with mandible over 3/4 as long as eye 
(Fig. 3); male with apex of metasomal tergum VII quadriden- 
tate, lateral teeth short and obtuse (Fig. 4) . 
. Prochelostoma 
Labial palp with 1 free segment; female with clypeus uniformly 
convex and with mandible less than 2/3 as long as eye (Fig. 2); 
male with apex of metasomal tergum VII bidentate (Fig. 5) or 
with 3 truncate processes (Fig. 6) Chelostoma 
15 (13). Notaulices elongate-linear; black (in all eastern species) 
. Hoplitis 
Notaulices punctiform-oval; usually metallic blue or green, 
rarely black . Osmia 
The males of the two introduced species of Chelostoma can be 
readily distinguished by the different shapes of their metasomal 
terga VII (Figs. 5-6). Female C. fuliginosum have apical, white, 
pubescent bands on metasomal terga I-IV; these bands are absent 
in C. campanularum. The size ranges of the two species do not 
overlap. 
Chelostoma campanularum is synonymized with C. florisomne 
(Linnaeus) in some European literature (i.e., Schmiedeknecht, 1930; 
Stoeckhert, 1933, 1954), but florisomne is actually a senior synonym 
of C. maxillosum (Linnaeus) (Richards, 1935). Chelostoma cam¬ 
panularum is a common species throughout Europe (except the far 
north), and occurs in Great Britain and north Africa. It is only 4.0 to 
6.0 mm long and in general appearance greatly resembles smaller 
specimens of Prochelostoma philadelphi and to a lesser extent very 
small specimens of some species of Hoplitis ( Alcidamea ). 
Chelostoma fuliginosum is frequently cited in the European 
literature under its junior synonyms C. nigricorne (Nylander) and C. 
rapunculi (Lepeletier). A complete synonymy, including three other, 
less-used, junior synonyms, is given by Tkalcft (1967). This species is 
common in northern and central Europe, although it is absent from 
Great Britain. It occurs sporadically in southern Europe and its 
range extends across the Soviet Union to Siberia. It is 7.0 to 9.0 mm 
