288 ENTOMOLOGICAL NEWS [Oct., 'l8 



Limnophila (Dactylolabis) nitidithorax sp. n. 



Wings deeply suffused with brown, unspotted ; body-coloration dark 

 brown, somewhat shiny; legs at the base, including the coxae, yellowish. 



$. Length 6.2-7 mm.; wing 6.4-7.1 mm. 



Rostrum and palpi dark brown. Antennae short, dark brown ; head 

 broad between the eyes with long scattered black hairs ; head brown- 

 ish-black, very sparsely grey pruinose. 



Thoracic dorsum dark brown, without distinct stripes, sublustrous, 

 very sparsely pruinose ; dorso-pleural membranes dull brown. Pleura 

 similar to the dorsum. Halteres short, yellow. Legs with the coxae 

 yellowish, the outer faces at the base darkened ; trochanters yellow ; 

 femora yellow, the tips dark brown ; tibiae and tarsi brown. 



Wings with a strong brownish tinge ; veins dark brown. Venation 

 as in the subgenus ; r at the tip of Ri; 7?<?+j short to very short; 

 Rs nearly perpendicular at its origin ; cell Mi deep, longer than its 

 petiole; basal deflection of Cui at, or just beyond, the fork of M. 



Abdomen dark brownish-black, the caudal margins of the segments 

 and a narrow dorso-median line black ; hypopygium black ; ventral 

 pleural appendages very long, digitiform, longer than the pleurites. 



Holot\pc\ $, Berkeley, California, May 16, 1915. (M. C. 

 VD.) 



Paratopotypes, three $ . 



The only regional species of this subgenus with the wings 

 unspotted is L. (D.) hortensia Alex. (British Columbia), a 

 grayish fly with quite a different wing-venation. 



The Lake Mosquito, Mansonia titillans Walk., and 

 its Host Plant, Pistia stratiotes Linn., in the Canal 

 Zone, Panama (Dip. : Culicidae). 



By L. H. DUNN, formerly Entomologist of Board of Health 

 Laboratory, Ancon, Canal Zone. 



(Continued from page 269) 



We have noted a few virgin females that, when confined in 

 cages, would take a blood meal nearly every day ; one speci- 

 men took 14 blood meals in 17 days, which is the longest time 

 that we have been able to keep M. titillans alive in captivity. 



In some instances the bite of this mosquito is quite painful 

 and produces considerable irritation. In other cases their bites 



