STOMATODEXIA. 239 
1. Stomatodexia cothurnata. 
Stomoxys cothurnata, Wiedem. Aussereur. zweifl. Ins. 11. p. 249. no. 5. 
Prosena maculifera, Bigot, Ann. Soc. Ent. Fr. 1888, p. 264, no. 55. 
Thorax whitish-grey ; abdomen yellow, transparent, with small blackish spots; antenne, palpi, proboscis, and 
legs yellow, the tibize more obscure, the tarsi black. 
Length 7-10 millim. 
- Head yellow, with a conspicuous silvery-white reflection ; front of the male very narrow behind, elongate- 
- trigonal, that of the female a little broader than the eyes; frontal band rufous (elevated in the male), 
narrower than the lateral portions ; lower part of the head with black hairs, Antenne shorter than the 
face ; second joint prominent, with a long bristly hair; third joint narrow, rounded at the tip; arista 
thickened at the base. Palpi filiform. Thorax and scutellum covered with a light tomentum, which in 
most specimens is whitish-grey in colour, but in some others has a more yellowish tint; thoracic dorsum 
with scarcely any trace of dark lines. Abdomen yellow, transparent ; second segment with three black 
spots on the hind margin—one dorsal, of trigonal shape, and two lateral; third segment with similar 
spots, the dorsal one more elongate ; anal segment with a black dorsal line and two lateral spots ; in some 
specimens these markings become obsolete or are even absent; the anal segment usually has white 
reflecting spots on the front border. Hind tibie darker than the others; all the tarsi longer than the 
tibie ; foot-claws and pulvilli elongate in the male, the pulvilli yellow, narrow. Tegule yellowish. 
Wings greyish-yellow ; small cross-vein on the middle of the discal cell; apical cross-vein concave ; 
posterior cross-vein curved. 
Hab. Mexico (coll. Bigot), Acapulco, Acaguizotla, Rincon, R. Papagaio, Chilpancingo, 
~ all in Guerrero 1200 to 4600 feet, Atoyac in Vera Cruz (H. H. Smith), Santiago Iscuintla 
in Jalisco (Schumann).—Braziu (Wiedemann). 
The description of Wiedemann is applicable in all respects, and, moreover, Professor 
Brauer has confirmed my determination, after having compared some of our Mexican 
examples with the original types in the Museum of Vienna. 
An examination of the typical specimen of the Mexican Prosena maculifera, Big., 
proves that this insect is the female of Stomatodexia cothurnata. 
9. Stomatodexia similigena, sp. n., ¢ 2. 
Thorax whitish-grey ; abdomen yellow, with obsolete blackish spots; antenne partly infuscated; proboscis 
black in the middle; palpi and legs yellow, the tarsi black. 
Length 7-5-9°5 millim. 
Agreeing with the preceding species in general coloration and in many other respects. The front of the male 
is less narrowed towards the vertex, that of the female much broader than the eyes; the antenne are 
rufous, the third joint fuscous on the anterior side and at the tip ; the proboscis is shining black, rufous 
at the base and at the terminal lips; the palpi are thicker, especially towards the tip ; the black hairs on 
the lower part of the head are short ; the black spots on the abdomen are less conspicuous ; the legs are 
shorter ; the small cross-vein is distinctly before the middle of the discal cell; the apical and posterior 
cross-veins are oblique and nearly straight. 
Hab. Mexico, Amula in Guerrero 6000 feet (H. H. Smith). 
A male and a female specimen. 
