Pomona CoiiLEGE Joiirnal op Entomology 839 



SCENOPINIDAE 



Scenopinus fenestralis I.iniie 

 Two spcciinciis wcri' collected ill Ijaymia. 



EMPIDIDAE 



Paracthallasius aldrichi Melaiuler 



Parathallasius sp. 

 This is ;m iindeteniiineil speeiiiieii ami is larger than ahlriclii, Init 

 reseiiihles it liilleh. 



DOLICHOPODIDAE 

 Hercostomus occidentalis n. sp. 



This firay (lolichopodid has a latei-ally eompressed eoiiical ahdoineii. 

 The eyes are red and the tliorax iridescent with metallic greens and t)lups. 

 The oci'ipiit is concave and the head slightly wider than the tliornx. The 

 antenna' ar(> short and thick with a long bare dorsal arista. At the end of 

 the second .joint is a circlet of short spines. The third .ioint is rounded on 

 the end. The head is flat and the eyes (juite large and not contiguous. The 

 antenna' are yellowish in color. The front is gray and pilose, and the legs 

 light .v<'llow, thickly covered with short spines. 



The s])ines are most all reclinate. There is one large supra-alar bristle, 

 two pairs of long intra-alar, and two large bristles on the back end of the 

 scutellum. There are two large oeellar bristles, one large bristle over the 

 eye, two pair of notapleiiral, and a long bristle .I'nst under the propleura. 

 There are three heavy spines on the front of the fore femora, one large 

 liristle on the humeral callosit.v, two on the middle femora, and one on the 

 back of the hind femora. There are two small oeellar bristles and the 

 aehrostiehal and dorsocentral bristles are small. The wings are hyaline. 

 Length 3.25 mm., wing the same. 



There was onl.v one specijiien collected at Laguna. 



Dolichopus bakeri 

 This species was determined by x\ldrich from a female. The thorax is 

 a beautiful bronze and green color. The hind tarsi are yellow at the base. 

 The third .joint of the antennie is large and round. (See Figure 266'). The 

 antenna- are black with gray pile on the third .ioint. The front is purple. 

 The arista is dorsal, long, slender, and hare. The sides of the abdomen are 

 a red lu'onze color and the rest of the bod.v a metallic green. The face is 

 white pilose, the eyes quite large with a black center and a reddish margin. 

 (See Figure 266). The spines are heavy and black and reclinate. The spines 

 on the tarsi are long and quite heavy. Tliere are two long oeellar and two 

 verv long supra orbital bristles. The emiiodia are small and white. The 

 head is slightly wider than the thorax. Wings hyaline. Length of fly 4.50. 

 Length of wing 4 iniii. 



