20 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



In connection with the study of the new species described below 

 the writer has arrived at the conclusion that the correct position 

 for insuetus is in the genus Ardalus wdiere it is very closely related 

 to the genotype species, A. aciculatus Howard. In fact, its resem- 

 blance to aciculatus is such that it is not an eas^^ matter to separate 

 them. A. aciculatus is represented in the National Collection by a 

 single cotype female the head of which has been removed by Girault 

 and mounted in balsam upon a slide where it has been ground to 

 bits beneath the cover-glass in an attempt to get at the mandibles. 

 The head from the type of insuetus has suffered a similar fate. 

 From what is left of the types it is possible to point out the follow- 

 ing differences. 



Dorsum of scutelUiin between the two parallel grooves nearly twice as long 

 as broad; parapsidal grooves very indistinct posteriorly; abdomen at base 

 above reddish yellow but with the margins darker, the yellowish area 

 rounded and not sharply defined; hind coxae inwardly rufous, outwardly 

 black; thorax and abdomen not broad aciculatus Howard. 



Scutelluni between the grooves nearly as broad as long; parapsidal gi-ooves 

 distinct but delicate posteriorly ; abdomen at base pale yellowish, nearly 

 white, the pale area extending to the margins and terminating posteriorly 

 in a nearly straight line at about one-third the abdominal length; hind 

 coxae inwardly as well as outwardly black or piceous; thorax and abdo- 

 men rather broad insuetus Gahan. 



ARDALUS ANTILLARUM, new species. 



Female. — Length 2 mm. Very similar to insuetus Gahan but more 

 slender in form, with the dorsum of the scutellum between the paral- 

 lel grooves distinctly longer than broad, the mesoscutum more deeply 

 sculptured and less shining; the hind coxae pale rufous on the inner 

 side and the hind tibiae brownish at apex. Differs from aciculatus 

 Howard by having the mesoscutum more strongly sculptured, and 

 the base of abdomen entirelj'^ pale yellow. Distinguished from 

 politus Howard by the aciculate-striate scutellum, and from levigatus 

 Howard by the sculptured frons and the absence of a dark patch on 

 the forewing. 



Frons and vertex faintly shagreened, the latter with a few moder- 

 ately large round punctures, lower part of frons and the face and 

 cheeks nearly smooth; antennal scape slender with five erect and 

 nearly equally spaced spines on the ventral margin, the one nearest 

 apex of scape longest and about its own length from apex ; pedicel 

 a little longer than broad and narrower than the funicle; ring-joint 

 small; first funicle joint the longest and nearly twice as long as the 

 pedicel; following joints subequal in length, increasing slightly in 

 breadth, the fourth joint subquadrate; club ovate, not as. long as the 

 two preceding joints combined, with two distinct joints and a very 

 small and indistinct terminal one; i^ronotum and mesoscutum finely 



