120 



A Monograph of Culicidae. 



Halteres with pale stern and fuscous asymmetrical knob. 



Length. — 5*5 mm. 



Habitat. — Songo, Bolivia. 



Observations. — Described from a single female. It is a very 

 distinct species told at once by the abdominal scales and thoracic 

 ornamentation. It is one of the largest and handsomest 

 Anophclines, and is at present the only one recorded from 

 Bolivia. 



Genus BIRONELLA. Theobald. 

 Ann. Mus. Nat. Hung. III., p. 69 (1905). 



Head with numerous upright forked scales of two kinds, and 

 with small thin outstanding irregular scales : palpi about two- 

 thirds the length of the proboscis in the $ , swelling gradually 

 to the apex, apparently 2-jointed (probably 3-jointed), last 



.;<:/! 



segment large and swollen ; 



f 



proboscis with very acuminate 

 labellae : antennae of $ plu- 

 mose. Mesothorax with nu- 

 merous short curved hairs over 

 its surface ; scutellum as in 

 Anopheles {i.e. simple, not tri- 

 lobed). Abdomen nude, but 

 hairy. Wings in the male with 

 the first sub-marginal cell very 

 small, the second posterior 

 large, stem of the former at 

 least four times as long as the 

 small cell ; the marginal cross- vein very long, the supernumerary 

 very small, the mid more than twice the length of the supernu- 

 merary ; the third long vein, also the stem of the second posterior 

 cell, and the upper branch of the fifth vein, bent in gentle 

 waves ; the two pseudo-veins very prominent. 



This genus apparently comes in the Anophelina, judging 

 from the non-scaly thorax and abdomen and the simple scutellum. 

 I have been unable so far to find a female. The most 

 marked feature of the genus is the venation. I know of no 

 Culicine in which the cells are bo unequal and irregular in shape 



Y\<A. 28. 



BirdneUa gracilis. Theobald 

 Bead icalef ; a, black ; 1>, c, and d, yellow. 



