CAEROLLIA IKIDESCENS 463 



Asas — Algumas escamas lateraes estreitas, em forma das de culex, sendo, por€m, 

 na maior parte obovaes como as de taeniorhynchus; as escamas no apex sao muito 

 aconchegadas, lembrando as azas de melanoconion; primeira cellula forqueada, 4 

 vezes mais comprida que o pedunculo correspondente; a segunda, quasi Igual ao 

 pedunculo; as veias a e & formam um angulo obtuso, aberto para a base da qual c se 

 approxima por mais de 2 vezes o seu comprimento; as escamas na costa e na primeira 

 veia longitudinal, como tambem a maior parte da 5a nervura, sao mais escuras e t@m 

 reflexo de bronze; as outras sao cinzentas; as escamas compridas da margen das azas 

 sao mais escuras no apex, tornando-se gradualmente mais claras na direcgao da base. 



A femea se distingue pelas antennas menos plumosas, os palpos mais curtos, as 

 unhas iguaes e pelos caracteres sexuaes. 



NoTA. — A descripsao 6 feita de exemplares criados de larvas encontradas em agua 

 de taquara na serra da Cantareira, i)erto de S. Paulo. 



B' uma especie muito bonlta e caracterlstica. 



Descbiption of Female, Male, and Laeva of Cabbollia mmESCENs: 



Female. — Proboscis slender, long, slightly swollen at tip, the labellse con- 

 ically tapered ; vestiture black with a blue reflection, setae rather coarse, longer 

 than usual, black, sparse. Palpi slender, one-fifth as long a^ proboscis, black. 

 Antennas moderate, joints subequal, rugose, coarsely pilose, black; hairs of 

 whorls moderate, sparse, black; tori subspherical, with a cup-shaped apical 

 excavation, luteous brown, silvery-blue pruinose. Clypeus rounded triangular, 

 blackish brown, nude. Eyes black. Occiput densely clothed with broad, flat, 

 subtruncate appressed scales, even on vertex, pale bronzy brown with an 

 iridescent reflection, and short, erect, brown forked scales with a golden reflec- 

 tion, broader and very dense on the nape ; a pair of coarse brown bristles pro- 

 jecting between eyes. 



Prothoracie lobes elliptical, remote dorsally, clothed with dark-brown scales 

 and black bristles. Mesonotum black, densely clothed with narrow, curved 

 bronzy-brown scales roughened by broader, intermixed suberect ones and coarse 

 pale ones around the ante-scuteUar space. Scutellum trilobate, clothed with 

 brownish yellow scales similar to those on mesonotum, each lobe with a group of 

 dark bristles. Postnotum elliptical, prominent, dark brown, nude. Pleurae 

 deep black on upper half, coxae and their insertions pale luteous, a strong pearly 

 violaceous reflection above, leaving an oblique median black bar, elliptical 

 yeUowish-sUvery scales on coxae and pleurae below, and rows of dark bristles. 



Abdomen compressed, somewhat expanded apically, truncate at tip; dorsal 

 vestiture deep black, segments with narrow basal yellowish-white bands, nar- 

 rowly separated at sides from a row of large lateral, basal, segmental, rounded 

 triangular, grayish-white patches which have a silvery-violet reflection in cer- 

 tain lights; first segment with a large patch of black scales and with fine 

 hairs; venter yellowish-silveiy scaled, tips of last three segments black scaled, 

 roughened ; apex of abdomen broad, bristly. 



Wings rather narrow, hyaline; petiole of second marginal cell one-fourth as 

 long as its cell, that of second posterior cell nearly as long as its cell ; basal cross- 

 vein distant more than its own length from anterior cross-vein; scales of veins 

 dense, moderately long, elliptical, intermixed with some long ligulate ones, 

 especially on fifth vein, dull brown, with a blue reflection on the costa. Halteres 

 with whitish stems and black knobs. 



Legs moderate, black scaled with bronzy reflection; femora yellowish white at 

 base and beneath to near apices, a pair of large spots on outer side of mid and 

 hind femora white with a violet reflection, one near middle, the other towards 

 apex; knees narrowly whitish scaled; tibiae with scales somewhat roughened, 

 hind pair with a pale line on inner side; tarsi with a bronzy reflection beneath. 

 Claw formula, O.O-O.O-O.O. 



Length: Body about 3.5 mm.; wing 3.5 mm. 



