1893.] MR. E. E. AFSTEN OX NEW DIPTEEOTJS INSECTS. 153 



base, and \Aith the band across the middle about twice as broad ; 

 third segment witli a distinct narrow ochreous band across the 

 base, widest in the middle and notched in the median line, tapering 

 towards the sides (in the second specimen in the collection this 

 band is merely represented b}' a faint line, but the specimen may 

 have been captured very soon after it emerged), and with, the main 

 transverse band much broader ; fourth segment with the " lunate " 

 marks represented by two stripes running straight from the front 

 to the hind margin ; each of these sends off a narrow oblique mark 

 from near its base to\Aards the lateral margin, as do the corre- 

 sponding marks in the $ , and from its extreme base a narrow- 

 line runs to the lateral margin, along the base of tlie segment ; 

 fifth segment with a straight stripe running from the front to the 

 hind margin on each side of the median line, and connected 

 together posteriorly, but apparently with no trace of the small 

 basal triangles : the legs are iwlcr i/dlow, but the brown markings 

 on the posterior pair and the posterior tarsi just as in the $ . 

 The antennce are orange, short, the thh'd joint rounded, and the 

 second and third joints and the tip of the first narroAvly dark 

 brown above ; the arista dark bro\\n ; the shining black spot above 

 the antennae narro\\er than in the 5 ; the front is clothed uith 

 short dark pile. The alvJa; and the shape of the ahdomen as in the 

 5 ; genitalia ochi'aceous. 

 Brazil, Yilla Xova and Santarem (Bates): two specimens. 



Baccilv rLAVE>'s, sp. n. (Plate Y. fig. 10, $ .) 



2 . Length 12^ mm. 



YeJJov, nearTij hare ; dorsum of the tliorax, e.veejit the sides, shinwr/ 

 oran(je-'riifot(S, ivith two (dilireviated j>ale yellow stripes, which are 

 chthed vjitJi shiriuneritKj whitish pollen : ahdomen deep ehrome-yelhw, 

 ivith narrow sMninff hrown transverse hands and, lineate marJcinr/s ; 

 hroad,Jlat, not contracted hasaUij, hut e.rpanding re<jtdarljj to the end 

 of the fourth segment. Legs whollij yelloiv. Wings ivith. an ochra- 

 ceous tinge, strongest toivards the anterior margin : alida' rudimentary . 



Face and rhcels pale yellow, shining, except the facial tubercle, 

 which is dull. Front somewhat deeper yellow, dull, the posterior 

 fifth dark olivaceous ; the slight antemiiferous projection shining, 

 pale yellow on the sides ; a conspicuous shining black dot above 

 the base of the antuunte ; above this is a small brown blotch, 1'rom 

 which a faint rufous median stripe runs back to tlie Aertex. First 

 two joints of the antemui' ochreous ; the third is missing. The 

 yellowish shimmering pollinosi; stripes of the dorsum of the thorax 

 only extend about two-thirds of its length, and divide the orange- 

 rufous area into a median and two lateral stripers, wliich are all ol' 

 equal breadth and coalesce posteriorly ; tlie sides of the dorsum, 

 pleura?, pectus, and metanotum metallic yellow: scutelhtm dull, 

 tawny ochraceous, orangc-ochraceous at the base, ylhdohien,; lirst 

 segment pale yellow, shining, w ith a narrow faint brow nish band 

 occupying the median two-fourths of the hind border ; second seg- 

 ment w ith a straight brown transverse^ band occupying about tlie 



