242 PROF. M. BEZZI. 



Cephalic chaetotaxy complete ; oc. rather short ; 2 i. or. ; ocp. thin, short, acute, 

 yellow. Thorax rather elongate, with the transverse suture broadly interrupted 

 in the middle ; chaetotaxy complete, but the middle scp. are wanting, while the 

 exterior ones are strong ; dc. placed a little behind the line of a. sa. ; only 1 mpl. ; 

 pt. stronger than the st. Scutellum broad, triangular with rounded sides, convex 

 above, with four bristles. Abdomen with bristles on sides and at end ; male 

 genitalia strongly developed ; ovipositor as long as the abdomen, conico-tubular, 

 pubescent above. Legs very long and slender, simple ; front femora with a few 

 (3-5) but strong bristles below on apical half ; middle tibiae with a single spur ; 

 the hind tibiae with a row of sparse but strong bristles. Wings long and 

 proportionally narrow, adorned with longitudinal yellowish bands and an oblique 

 apical streak. Costal bristle short, but distinct ; 2nd longitudinal vein straight ; 

 3rd longitudinal vein bristly throughout its whole length, bent below in its last 

 portion and there parallel with the last portion of 4th ; small cross-vein placed very 

 near the base of the long and narrow discoidal cell, which is more than twice as long 

 as the 2nd posterior cell ; hind cross- vein oblique outwardly, about as in Ceraiitis ; 

 anal cross-vein bent in the middle ; lower angle of anal cell with an acute point, 

 which is a little longer than the 2nd basal cell ; last portion of 4th vein gently curved 

 above near the base. 



1. Xanthorrhachista cephalia, Hendel, Wien. ent. Zeit., xxxiii, 1914, p. 81. 



A beautiful fly of large size, readily distinguished by the black spots on the thorax 

 and the yellowish longitudinal stripes on the wings. 



^ §. Length of body, 8-9 mm. ; of ovipositor, 3 mm. ; of wing, 9-10 mm. 



Head entirely testaceous, shining only on the occiput ; frons more pale yellowish 

 in front and face more whitish ; there are no dark spots whatever, even on the ocellar 

 area ; occipital swellings whitish below, chiefly in the male, and clothed with pale 

 yellowish hairs. Antennae entirely pale yellowish or whitish ; the bristles of the 

 second joint and the arista are yellowish. Palpi pale yellowish or whitish, with 

 yellow hairs and bristles ; proboscis dirty testaceous. Cephalic bristles mainly 

 reddish yellow, only the 2 s. or., and sometimes the oc. or one of the i. or. being 

 darkened or even black. Thorax shining testaceous, with the humeri and a meso- 

 pleural stripe more or less yellowish or whitish ; on the back there is a thin whitish 

 dust and a short pale pubescence ; on the pleurae there are longer but sparse 

 whitish hairs. The black dots are small and rounded, disposed as follows : a pair 

 just behind the suture, in front of the dc, being the most conspicuous and shining ; 

 two pairs on the sides, velvety opaque, the one just below and behind the a. sa., the 

 other smaller on the postalar callus, near the base of sides of scutellum ; more 

 difficult to see is a third small, elongate dot, very near the root of wings. Meso- 

 phragma and hypopleural callosities shining yellowish, the latter not forming a distinct 

 spot. Scutellum like the thorax ; its three small black dots shining, the apical one 

 placed between the a. set., the lateral ones below and behind the b. set. ; on the disc 

 there are sparse and short, yellowish hairs. All the thoracic, scutellar and pleural 

 bristles are reddish yellow in colour. Halteres pale yellowish. Abdomen coloured 

 and shining like the thorax, wholly immaculate ; its pubescence reddish yellow, like 

 the bristles, which are sometimes infuscated on the last segments. Male genitalia 



