1913] Al.xandct^.Xetf Xeolropical Aulocliiiii 49 



Ceratocheilus. All of the six't-ics liilliorto ({.■sciilu'd ;iic Aliicaii. 

 C. cornigerum S])eiser has sj)otled wings but C. tjilcKi Kdwards has 

 hyaline wings like the New World form. 



The discovery of this genus in America is very iiiteiosling and 

 we may likewise expect Siyringomyia to turn up in the Xcotroijical 

 fauna, when further collections are made. 



Ceratocheilus americanum sp. nov. 



Wings unspotted; thorax with dorsal stripes. 



$. Length, 10.5 ram. (e.\cluding rostrum); wing, 5.3-6.2 mm.; rostrum, 5,0 

 mm. 



Fore leg, femur, 5.5 mm.; tibia, 5.7 mm.; tarsus, 5.2 mm. 



Middle leg, " 5.-t mm.; " 6 mm.; " 4.8 mm. 



Hind leg, " 5.8 mm.; " C mm.; " 4.5 mm. 



The measurements of the legs and body appertain to the 9 with the largest wing 

 (6.2 mm.), the paratype. 



Head: rostrum and palpi dark brown; antennfe dark brown; front brown; ver- 

 tex and occiput brown, with a greyish bloom behind; gcnje grey. Eyes brilliant 

 metalhc greeu. The corniculus represented by a rounded plate above the base of 

 the antennte. 



Thorax: coUare very dark brown; prothorax concealed from above by the over- 

 projecting mesonotum, only the lateral ends of the scutcUum, which shows above 

 the humeri as a rather square brown knob on either side. Mesothorax, pra^scutum 

 very light buff-colored with dark brown longitudinal stripes; llie middle one is 

 broad, begins at the cephalic margin of the sclerite and continues back almost to 

 the suture; on its caudal portion it is indistinctly divided by a pale median vitla; 

 lateral stripes begin behind the pseudosutural fovea;, continue back to the scutum 

 wTiere they cover the lobes; extreme lateral edge of the priescutum buff-colored; 

 scutum dark brown except the pale median depression; scutelhim pale greyish- 

 buff; post-notura thinly greyish with indistinct brown stripes on the sides. PleuriE 

 greyish with brown patclies on the sides of the sternum; on the racsoplcurte, just 

 before the wing basis and another just behind the fore coxa; sternum buffy-grey. 

 Halteres, stem light-colored, knob dark brown. Legs: coxa; and trochanters yel- 

 lowish-brown; femora light brown; tibia; and tarsi darker brown. Wings: sub- 

 hyaline, unspotted; veins dark brown. Venation: (See fig. e.); Sc ending just 

 beyond the origin of Rs; Rs oblique, about as long as Ra+j; Ri beyond Rs about 

 as long as the deflection of R 4+s. Basal deflection of Cui before the fork of M. 



Abdomen : tergum, scleritcs dark brown, from the third outward with the basal- 

 fourth light yellowish; valves of the ovipositor long and slender (Sec fig. j.). Ster- 

 nites dull yellow, the extreme tip of segments one to four brown; a narrow, 

 indistinct, linear, brown, median stripe. 



Holotype: 9. Culebra, Panama, Central America. Feb. IG, 1902. (W\ M. 

 Black, coll.) Paratype. 9 , Igarape-assu, Para, Brazil. Jan. 30, 1912 (H. S. Par- 

 ish, coll.) 



