Criorrhina. 49 1 



Thorax quadratic or in the more elongated species rectangular. Scutel- 

 lum concolorous with thorax, generally pruinose; it has no marginal 

 fringe below {berberina, oxyacanthae) or a more or less distinct fringe 

 is present (floccosa, asilica); no bristles present; metapleura with dense, 

 short hairs, a little longer at the hind margin. Abdomen somewhat 

 varying, in the shorter species it is short, broader than thorax and 

 somewhat rounded; in the longer species it is narrower, somewhat 

 elongate, a little narrowing behind; in the male there are four not 

 transformed segments on both sides. Genitalia large, largest in the 

 elongated species; there are somewhat long and forceps-like terminal 

 appendages, and hairy outer laraellæ. In the female there are five 

 normal abdominal segments, and at the end two small lamellæ. Legs 

 simple or sometimes the hind femora thickened (in non-Danish species) ; 

 the hind tibiæ a little curved and generally somewhat compressed, 

 especially on the basal and apical parts, the middle part more 

 thickened; the legs haired as usual, femora rather long-haired; above 

 the trochanters the curious long, bi'istly hair present, or sometimes a 

 pair, they are most distinct on anterior trochanters. Glaws and pul- 

 villi well developed; empodium short, bristle-shaped, hairy. Wings 

 with the cubital vein not curved; medial cross-vein considerably behind 

 the middle of the discai cell, very sloping ; the base of the radial vein 

 with fme bristles; no stigmatical cross-vein or only an indistinct one. 

 Thoracai squamula with long, more or less richly branched hairs, 

 alar squamula with shorter, flattened hairs. Plumula of medium length, 

 with simple hairs. 



The developmental stages are not well known; van Roser (Wiirttemb. 

 Gorr. Bltt. 10, 1834, 268) found the larva of C. oxyacanthae in flood 

 refuse at Neckar, but I have not seen this paper; Verrall suggests that 

 the larva lives in sap of decaying trees. I have examined a pupa of 

 C. berberina found under moss on a tree-stub at a fen on '^^/i, it 

 developed on '^k. The pupa is similar to that of Tropidia: it is nearly 

 cylindrical but flattened on the ventral side; it is a little attenuated 

 in front and more behind and it has here at the sides some short 

 filaments; the anus lies at the beginning of the attenuated part, rela- 

 tively long before the posterior end, at the posterior end is an about 

 1 mm long, reddish yellow, flattened cylindrical spiracular process; it 

 has a longitudinal dividing line above and below, the end is flat and 

 bears the spiracles; on the dorsum of the first abdominal segment 

 are two short, about 0,5 mm long anterior spiracular tubes; they are 

 brown, beset with tubercles and rather approximated. I could detect 

 no traces of ventral prolegs. The colour is dirty yellowish and the 

 length nearly 8 mm. 



