Mallota. 473 



large. Legs somewhat robust, hind femora strongly thickened, with a 

 small svvelling with dense hairs belovv near apex; hind tibiæ broad 

 and compressed; tarsi somewhat broad and flat; the curious, long 

 bristle above the trochanters present, sometimes represented by two, 

 close-standing hairs. Glaws and pulvilli large and strong; empodium 

 small, bristle-shaped, hairy. Wings as in Helophilus, the subcostal 

 cell narrowly open; the basal part of the radial vein with fine hairs. 

 Stigma small, stigmatical eross-vein present. Thoracai squamula as 

 in Eristalis, with long, branched hairs, alar squamula with short, 

 flattened hairs. Plumula not long, with branched hairs. 



The above description refers to the sole Danish species, cimbicA- 

 formis; this species belongs to the subgenus Zetterstedtia, created by 

 Rondani for the species with bare eyes, which are approximated in 

 the male, and with strongly thickened hind femora ; a group of species 

 has the eyes hairy, separated in the male, and the hind femora more 

 slightly thickened ; these species then come in Mallota s. str. The 

 American species posticata Fabr. has hairy eyes but they are approx- 

 imated in the male. Most species have a rather short, somewhat 

 rounded abdomen in contrast to the longer abdomen in cimhici- 

 formis. 



The developmental stages are described by Becher {M. eristaloides) 

 (Wien. ent. Zeitg. I, 1882, 253) ; he found the larvæ and pupæ in a 

 hoUow poplar at the end of May, the imagines came at the beginning 

 of June. I have examined larvæ found in holes in a maple-tree and 

 in a beech on ^h and ^^h. The larva is similar to an EristaUsARvya, 

 but it is more flattened, not cylindrical but elliptical in a transverse 

 section; the antenna-like papillæ and the anterior spiracles as in 

 Eristalis; the body is very strongly and deeply corrugated; the dermis 

 is so finely chagreened that it is practically smooth, but the usual 

 regularly arranged larger spines are present and distinct, and they 

 are divided into several branches; especially those at the sides are 

 long; on the ventral side there are likewise seven pairs of proleg-like 

 warts beset with small spines, one pair on prothorax and six on the 

 first six abdominal segments; at the posterior end the body is much 

 flattened and the spines at the sides are here prolonged to papillæ 

 increasing in length backwards and divided into several hairs at the 

 end; the tail-part is rather thin and long, and able to be much 

 elongated ; as in Eristalis it consists of a long, corrugated basal part, 

 a longitudinally striated middle part and a chitinous end part; there 

 are also here four small papillæ on each side of the first division, 

 one at the base, one at the apex and two intermediate ; besides there 

 are branched hairs on the sides of the basal part of first division. 



