Syntomocera. 265 



directed bristle above. Cheeks liairy. Vibrissal ridge not sharp, con- 

 verging below; vibrissæ bristly, pluriserial, somewhat ascending; 

 a large vibrissa present on the angle, placed somewhat above the 

 lower margin of epistoma. Epistoma not retreating, not reflected 

 below, witli a low, not sharp carina above. Oral aperture not small. 

 Oral cone and proboscis of medium length; clypeus horse-shoe-shaped. 

 Palpi thread-like, very slightly dilated outwards. Antennæ inserted 

 below middle of the eye, short, third joint slightly longer than second; 

 arista short-plumose. Thorax rectangular; four postsutural dorso- 

 centrals and three præ- and three postsutural acrostichals. Scutellum 

 with about four marginal bristles on each side. Three sternopleural 

 bristles. Pteropleura with hairs and a bristle above. Abdomen conical; 

 excavation on second segment reaching hind margin; there are discai 

 and marginal bristles, second segment without bristles; fifth covered 

 with bristles. Legs long with long tarsi with elongated joints; claws 

 and pulvilli in male strongly elongated. Wings with first posterior 

 cell closed at margin or short-petiolate, ending somewhat before 

 apex of wing; discai angle almost rectangular, with a short veinlet; 

 no or a small costal spine. 



The species petiolata has been bred from the pupa of Rhizotrogus 

 solstitialis . 



Of the genus 4 European species are recorded, one occurring in 

 Denmark. 



1. S. petiolata Bonsd. 



1866. Bonsd. Fini. Ins. II, 131, 13 {Dexia). — 1893. B. B. Denkschr. 

 Akad. Wiss. Wien, LX, 223. — 1907. Kat. palåarkt. Dipt. III, 443. — 1921, 

 Baer, Zeitschr. f. angew. Entom. VII, 380. — 1924, Stein. Arch. f. Naturgesch. 

 90, 6, 236, 2 (DexiomorpJia). ■ — Dexia cristata Walk. (nec Meig.) 1853. Ins. 

 Brit. II, 95, 2. — 1889. B. B. 1. c. LVI, 118. — 1896. Pand. Eev. Entom. XV, 

 153, 1. — 1907. Villen. Ann. Soc. Ent. de Fr. LXXVI, 393. 



Male. Frons narrow above, widening downwards, somewhat 

 protruding; cheeks broad. Head silvery grey pruinose, jowls partly 

 red in some views; frontal stripe velvet brownish black. Orbits and 

 cheeks with fine hairs; jowls black-haired behind. Occiput grey, with 

 black hairs and yellow hairs inwards. Antennæ yellowish red, third 

 joint slightly longer than second. Palpi yellow. Thorax black, grey 

 pruinose, with four black stripes, the median narrow, abbreviated 

 behind, the lateral broader; scutellum more or less brownish at apex, 

 or almost quite black. Thorax black-haired; three posthumeral and 



