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PUERTO RICAlSr IMORDELLISTENA RAY 395 



MORDELLISTENA LINEATA, new species 



Figure 28, q 



This species is most closely allied to the North American ancilla 

 LeConte (1862, p. 50), which it resembles in coloration; it may imme- 

 diately be separated by its larger size and the smaller number of ridges 

 on the posterior tarsi. 



Length: 2.1 mm; including anal style, 2.9 mm. Elongate, sub- 

 parallel; dermal color black, except for the following flavocastaneous 

 areas: Front of head, maxillary palpi, seven apical segments of anten- 

 nae, a broad median stripe on elytra, reaching base at humeri and 

 extending to apex, anterior and middle legs, and hind trochanters, 

 tibiae, and tarsi. Surface densely covered with recumbent pubescence, 

 silvery everywhere, except on flavocastaneous areas, where it partakes 

 of ground color. 



Head convex; antennae 0.8 mm long, reaching base of abdomen; 

 segments 3 and 4 equal; 5-10 each as long as 3 and 4 together; 11 

 rounded, one-fourth longer than 10. Apical segment of maxillary 

 palpi enlarged, form of an isosceles triangle. Prothorax slightly 

 broader than long (0.65 by 0.6 mm), sides rounded, base arcuate, mid- 

 basal lobe short, subtruncate. Scutellum small, triangular. Elytra 

 slightly more than twice as long as broad (1.5 by 0.7 mm), sides 

 slightly curved, apices individually^ rounded. Posterior tibiae with 

 two oblique ridges, the basal one extending entirely across outer face, 

 the other as long as half width of tibia; basitarsi with two oblique 

 ridges, second segment with one. Anal style almost three times as 

 long as apical ventral segment, attenuate to apex. 



Type locality. — Guanica, Puerto Rico. 



Type.— Male, U.S.N.M. no. 51601. 



Remarks. — Both the type and allotype were collected at Guanica on 

 June 26, 1934, by C. M. Matos. There is no visible external difference 

 in the sexes. 



MORDELLISTENA BARBERI, new species 



Figure 28, d, n, o 



This species may be separated from its closest ally, lineata, by the 

 comparatively longer length of antenna! segments 3 and 4, the different 

 maculation of the elytra, and the smaller size. 



Length: 1.65 mm; including anal style, 2.3 mm. Elongate, sub- 

 parallel; derm bicolored, mostly yellowish white, except for the fol- 

 lowing fuscopiceous areas: Sides of mesosterna and metasterna, an area 

 on elytra surrounding scutellum, and a transverse, premedian, elytral 

 fascia, broadened at sides, and narrowly extending along suture to 

 basal area. Surface densely covered with fine recumbent pubescence, 

 partaking of ground color. 



