16 



UNITED STATES NATIONAL MUSEUM BULLETIN 2G3 



and black just, below the middle, wliere there is an 

 irretiiihir-shaped, rlionibic or ([uadrate (small to lar^e), 

 brown to black spot; eye-margins very nariow, some- 

 what elevated, more or less shininu;; xcrtical calli 

 rather ill-tlefined flat, shining witli two or tliree I'ows 

 of black minute setae; ocellar triangle rather distinct 

 and black, about 1/4 as wide as vertex; luiuile distinct, 

 witii a longitudinal median sulcus, sliining, brown to 

 brownish black. Face (|)l. (i, fig. 4) didl \\a.\y yellow, 

 tinged near inferior coriuMs; in pi-ofiie (pi. (i, tig. 2) 

 below antennal roots there is a small, flat median 

 elevation, someuhnt iiollowcd below, then somewhat 

 l)roduced forward at ei)istonia. Back of head (pi. (i, 

 fig. 2) moderately swollen, u|)per portion somewhat 

 hollowed. ])ale brownish yellow, the orbital borders 

 pale yellow. All bristles i)lack. weak except vertical 

 bristles, wiiich are rather strong, the imier ])air longer 

 than outer; oceliai' t)ristles very Tiiinute; inferior froiito- 

 orbilals two ])airs, their roots being black but some- 

 times not tinged, su])erior one ])air which stand on 

 apex of \erticai calli, (]islincll\- i)lack around their 

 roots, and the inferiors are two ])airs, tiie distaiu-e 

 between the up|)er |)air of inferiors and llie su])erior 

 is almost always a little greater tiian that between the 

 two inferiors, but in some cases equidistant; gemd 

 bristle conspicuous. Antennae (])1. G, fig. 5) a little 

 longer than face, brownisii yellow with third segment 

 brown to blackisii brown, base yellowish ; first segment 

 longer than wide, cyliiuii-ical, slightly tiiickened a])i- 

 caliy; second segment about 1 ..'> limes as long as the 

 |)receding, distinctly broadened apically, witii a con- 

 spicuous black nu^lian bristle. Some black bristly hairs 

 along the apical mai-gin; tiiird segment 2.") times as 

 lo7ig as second, laterally compressed toward apex, 

 nearly parallel-sided with louiul apex; arista near base, 

 quite bare, black with three l)asal segments yellowish. 

 Palpi (|)1. (), fig. fi) pale yellow, ratiier short and broad. 

 broadest just before middle, the ui)i)er margin slightly 

 concave, gradually narrowed toward rounded jipex, 

 spansely ])ubescent over entire surface; jjroboscis 

 comparati\ely short, brown to blackisii l)rowii. 



Mesonotum (pi. 6, fig. 7) distinctly narrower llian 

 head at anterior nuirgin and broadened ])osteriorly, 

 broadest a little before the scutellum, reddisli brown to 

 i)rown, mostly greyisli tomentose and yellowish-biown 

 l)ubescent, with a i)air of blackish, nearly straight, 

 rather narrow, submedian longitudinal streaks from 

 near the iulerno-anterior corners of humeral calli to 

 middle of (he meta/.ona thr;)Ugh the inner ends of trans- 

 ver.se sutures, sometimes interru|)ted at the sutures, 

 between those two streaks a \ery fine blackish or 

 brownish stripe from anterior nuugin to basal tbird of 

 metazona; black subhiteral longitudinal streaks from 



hind nuirgins of humeral calli to near the basal corners 

 of scutellum along the iiuiei- sides of the lateral post- 

 sutural calli. those streaks almost always ill dclincd 

 and often bidadly interrupted about the sutures, some- 

 times ap|)earing oidy as two s])ots, one on the middle 

 ])ortion of the pi'ozona jind other on the posterior 

 ])ortion of the meta/.ona; iiumeral, iiotojjleural, and 

 lateral postsutural calli yellowish white, the latter 

 being rather nai'row. .Scnielluiii moderate in size, aiioul. 

 half as long as wi(h', whitish yellow with the large 

 median ])ortion wax\- white. Pleiu'a (pi. (i. fig. S) mostly 

 l)lack. tiie propleui'oii .■uid many siitiiral areas reddish 

 brown, whitish tomentose except the whitish yellow, 

 meso-, stertut- and metai)leural s|)ots, the latter dis- 

 tinctly ili\i(lc(l inlo two (metaiu)tal atul mctapleural) ; 

 meso|)hi'agnui i)lack with a pale I'eddish-brow n median 

 longitudinal streak extending through the black nu'tano- 

 tum. All brisiles black; scapulars 2, notopleurals 2, 

 su|)ra-alars H (one anterior, two posterior), prescutellars 

 one pair, scutellars two pairs, mesojjleural 1, j)teio- 

 pleui'al 1 . 



Abdomen (])1. 6, fig. 12) nearly as wide as thorax, 

 reddisli yellow, yellow i)ubescent; first tergum strongly 

 narrowed at base, with rather broad blackish lateral 

 margins and one small brown longitudinal median s])ot, 

 the latter often wanting; second tergum also with rather 

 narrow blackish lateral margins; at basal boi-der one, 

 I'arely three, small, ill-defined brownish or blackish spots 

 which are sometimes united with the median spot of 

 preceding tergum; third to fifth terga each with one pair 

 of triangular black lateral spots and one median 

 longitudinal streak of similar color, the latter sometimes 

 interrupted at the suture between the third and fourth 

 terga, the lateral spots on the third tergum sometimes 

 extending to median streak on the basal margin; cilia- 

 tion of bristles of the third tergum in male never 

 develo])ed. \'entral surface yellowish, sterna castaneous 

 to blackish, posterioi- imirgin of each sternum often 

 very narrowly yellowish. 



Wing (pi. (), fig. ]) moderate in size, grailually 

 narrowed towiwd apex, very slightly smoked Imi M 

 cpiite clear; costal and amd bands blackish, the furnicr 

 in the secoml costal cell paler Inward base, first costsd 

 cell hyaline, not broadciu'd to K4j..^; apical blackish 

 spot occupying aixiui anli'io-apical half of R,-,, united 

 with costal band aboNc; an;d sireak not extending to 

 wing margin and nol broadened below anal \ein: 

 su]:)ermmler^u•v lobe and the black shaggy hairs never 

 develo])ed. The vein Ki bristled throughout-; R4+.5 

 distinctly bristled except apical one-third: r-m oblique 

 and somewhat mululate, placed distad of the middle 

 of iMj; m-cu somewhat S-like; prolongation of anal 

 cell a little longei' than the cell proper. 



