300 



PROCEEDINGS OF THE NA TIONAL MUSEUM. vol. xxxiii. 



closely related to Oomphus, we liave 2 sinall species a])Oiit ecfiial 

 in size to BurTruujomphus ve/nnieulatus , described l)elow, but in Lan- 

 thus no such reduction of the anal area takes })lace. In Goniphinai 

 generally, however, small size is associated with reduced anal area 

 (there are notable exceptions), so the value of this character for 

 generic distinctions is open to question. In the minute Microgomphus 

 reduction of anal area reaches its maximum in the subfamily and 

 there are only 2 rows of postanal cells. In the venation of the front 

 wing Burmagomplius is at once separated from Gomphus by the paral- 

 lelism of M^ and Cuj, a character it shares in common with several 



other genera, notahlj OnycJiogom- 

 pJius. By its well-braced stigma, 

 strongly and symmetrically forked 

 Mi_2 and Mg, reduced and defi- 

 nitely placed cross veins between 

 Mi_3 and M^, distinctly and strongly 

 shaped postanal cells in the hind 

 wing, paralleling of M^ and Cu, in 

 front wing, undivided triangles, 

 supertri angles and subtriangles, 

 and absence of basal ante nodals 

 of the second series, Burmagomphus 

 allies itself with the venationally 

 highly specialized genera of Gom- 

 phinse. (See "fig. 27.) 

 The relatively greatly developed and widely divaricate inferior 

 abdominal appendage of the male suggests to a certain extent some 

 species of Gomphus and the following genera: Notogomplius, Aniso- 

 gompJius, Neogomnplius, and Cyclogomphus. Of these genera I know 

 the venation of all but Notogomphus, in which there is not the great 

 difference in the length of abdominal segments 9 and 10, as in Burma- 

 gomplms, and the superior appendages are about twice as long as the 

 inferior, and not about equal as in Burmagomplius. Moreover, the 

 color patterns of both thorax and abdomen are very different in the 

 two genera. In the thoracic pattern Burmagomplius is unique among 

 Gomphinre, so far as known to me, in having the dorsal stripes united 

 below on either side with the antehumeral stripes, the upper end of 

 the reduced antehumerals represented by a rounded spot. 



Abdominal segments 8 and 9 about equal, about two and two- 

 thirds times as long as 10. 



Legs short, hind femora slender, 5 mm., reaching to base of second 

 abdominal segment, armed with short spines. 



Fig. 28.— HuRMAGOMrms vermiculatus from 

 Burma. A, lateral, and b, dorsal views 

 OF male abdominal appendages. C, profile 



OF ACCESSORY GENITALIA OF ABDOMINAL SEG- 

 MENT 2. 9 AND lO. ABDOMINAL SEGMENTS. 



