1898.] NATURAL SCIENCES OF PHILADELPHIA. 177 



Genus LUCILIA. 

 Lucilia spinicosta nov. sp. 



One male and one female, taken March 10, 1894. Length : 

 about 5.5 mm. (male) and 6.0 mm. (female). Width of head: male 

 2.0 mm. female 2.2 mm. Width of front: male 0.1 mm. at narrow- 

 est part, females 0.8 mm., vitta of female 0.5 mm. Third antennal 

 joint twice as long as the second. 



Color. — The usual metallic green of Lucilia? with some hoary re- 

 flections. Legs yellowish-brown, femora much darker than tibiae 

 and tarsi. Tegulae : inferior dark smoky brown almost black, supe- 

 rior hyaline. Halteres yellowish. Genre, geno-vertical plate, pos- 

 terior orbit, buccse and vibrissal ridges silvery-white. Antennae: 

 second joint and base of third yellowish-brown, remainder of third 

 chestnut-brown. Palpi yellowish-brown. Wings hyaline, slightly 

 stained with yellowish-brown toward the costal border. 



On the costal border of the wing, basad of but very close to the 

 end of the auxiliary vein, is a good sized spine. On both the upper 

 and under surfaces of the wing the third longitudinal vein bears a 

 number of minute spines, those beneath are four or five in number 

 and much more delicate than those above, those above are ten or 

 twelve in number and extend nearly to the small cross vein. 



Bristles of the Head. — As usual in Luciliae. 



Bristles of the Thorax. — I, 7a, 7b, 7c. Humeral, 3. Post humeral, 

 2. Dorso-central, 5, 2 in front and 3 behind the suture. Intra alar, 

 4, one in front and 3 behind the suture. Acrostichal, 5, 2 in front 

 and 3 behind the suture. Presutural, notopleural, supra alar and 

 post alar as usual. Scutellar, apical, 3 marginal and one discal. 

 Sternopleura and mesopleura as usual in Luciliae. 



Bristles of Abdomen. — On hind border of second segment a num- 

 ber of small appressed bristles. On hind border of third segment 

 about twelve to fourteen larger and less appressed bristles. On the 

 fourth segment about twelve not at all appressed quite good sized 

 bristles both marginal and discal. In the male these bristles are 

 larger than in the female. 



Bristles of the Legs. — Fore Leg. — Femur : as usual but dorsal 

 lateral extensor row has only about six members. Tibia : in the 

 lateral extensor row there is in the male, but not in the female, a little 

 basad the junction of middle and apical thirds one rather prominent 

 bristle ; in the lateral flexor row there is one large bristle at the 

 junction of the apical and middle thirds ; in the mesal extensor row 



