Hymenoptera aculeata collected in Algeria. 403 



$ 2, ^ 5. Biskra, on Atractylis serratuloidcs and Antir- 

 rhinum ramosissimum, 6-13, iv, 97. 



$ 2. Biskra, on Amberboa lippii, 8, iv, 97. 



Several of the above specimens are stylopized (JCenosl). 



Pterochilus aterrimus, n. sp. 



Ater, atrohirtus, punctatus, mandibulis, capite utrinque pone 

 oculos, et in femina interdum clypeo et oculorum orbitis interioribus, 

 tibiis anterioribus antice, articuloque apicali palporum labii, rufo- 

 ornatis ; alis valde infumatis. 



Black, densely clothed with long black hairs, especially in the <$ , 

 mandibles more or less red, generally nearly entirely so, but in one $ 

 with only the extreme apices of that colour, a spot of variable size 

 behind 'each eye, and in one female two large spots on the clypeus and 

 the inner orbits of the eyes red. Anterior tibiae in front in both sexes 

 and the much curved, flattened apical joints of the labial palpi of 

 the same colour, wings dark brown with purple reflections. Head 

 and thorax rugosely punctured, somewhat shining, anterior margin 

 of the clypeus narrowly emarginate in the <$ semicircularly rounded 

 and entire in the $ ; apical joint of labial palpi in the $ fiat and 

 dilated, fringed with very long hairs, in the <£ sub-cylindrical with 

 hairs as long as those of the § > but nner an d less regular. Antennas 

 in the $ slightly rolled at the apex. Penultimate and apical joints 

 very small, especially the latter, posterior wings clearer than the 

 anterior ; legs shining, punctured, the inner sides of the first and 

 third pairs of tibia? densely clothed with fine pubescence in both 

 sexes ■ projjodeum with an angular tooth on each side ; abdomen 

 nigro cyaneous, largely punctured on its basal segment which bears 

 a slightly raised tubercle in the centre of its basal brow, finely 

 punctured on the rest, first and second segments in the £ first only in 

 the § clothed with long hairs, apical margins of the ventral segments 

 with a row of exceedingly short bristles. 



Long. 14-16 mm. 



Biskra, $ 1, amongst hummocks of Limoniastrum guyo- 

 nianum on the Dunes by the route des 

 Zibans, 19, iii, 94. 



£ 1, visiting Brassica napus, 3, iii, 97. 



$ 1, between Biskra and Hamman-es-Salahin. 



$ 3, at rest on dead twigs of D&niia cordata at 

 5 p.m., holding on by the mandibles and 

 legs; wings divergent, 14, ii, 97. 



