Hymenoptera aculeata collected in Algeria: the Sphegidae. 111 
2""" basi truncatum potius (sed obtuse) quam simpliciter rotundatum : 
segm. ventralia subapicalia fimbriis nullis. Pygidium ¢ bidentatum 
vel bispinosum, 9 simplex (haud ut in rufo quasi-bidenticulatum), 
Collaris anguli apicales bene definiti, in Q etiam acuti. 
Puncta corporis subcoriacei mediocriter densa ac crassa. 
Alae anticae venae cubitales 2 et 3 in radio haud confluentes, sed 
inter se fere tantum distantes quantum cellulae 2° apex a radio. 
Area analis alae posticae paullo post originem cubiti terminata. 
Long. circ. 6 mm. 
ALYSON RATZBURGI, Dhlb. 
2224, 1 §. Constantine, visiting Thapsia garganica 
17. and 18. v, 95. <A. E. E. 
DIDINEIS NIGRICANS, n. sp. 
1 g. Biskra, 24. v, 98. F. D. M. 
Species D. crassicorni, Hdl.,statura parva, antennarumque articulis 
penultimis latitudine sua haud longioribus, similis et affinis. Differt 
tamen articulo harum ultimo simpliciter curvato et elongato (haud 
contorto) fere ut in D. lunicorni sed evidenter crassiore : item clypeo, 
orbitis oculorum, scapis antennarum, tegulis alarum, tuberculisque 
humeralibus flavedine omnino carentibus; facie inferne non 
argenteo—sed potius pallide aureo—pubescente ; segmentis que 
abdominis basalibus haud distincte rufis, sed poene totis nigris, 
tantum marginibus ipsis valde obscure rufescentibus. 
Clypeus evidenter tridentatus. Vertex politus, fere impunctatus, 
Thorax cum abdomine toto superne subtilissime punctatus, et 
inconspicue breviter pilosus. Puncta abd. segmenti 1™ sparsa sed 
distineta, reliqui corporis densiora. Abdomen infra pilis longis 
sub-pilosum. 
Long. 5 mm. 
This # seems clearly to stand nearer to crassicornis than 
to lunicornis, but to be in certain respects intermediate 
between them. Itseems far too small to be the 7 of either 
wustnet or pannonica, since Handlirsch puts the length of 
their 22 at 9-10 mm. and 9 mm. respectively. These 
species are only known from the north part of the Balkan 
district (Dalmatia, Hungary), and it is perhaps not very 
likely that they should occur in Algeria. 
It must certainly be a close ally ‘of erassicornis, but the 
differences indicated above appear to me sufficient excuse 
for treating it as specifically distinct. 
It differs from any Didineis yet described in not. having 
