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U. S. NATIONAL MUSEUM BULLETIN 2 09 



4. Frons, pronotum, and mesoscutum with dense appressed pubescence, the 



individual hairs long enough and close enough to overlap considerably. 



Subspecies of brevis 5 



Frons, pronotum, and mesoscutum with a sparse appressed pubescence, the 

 individual hairs not long nor dense enough to overlap much 7 



5. Metapleuron and propodeum partly or mostly polished or subpolished; punc- 



tures on propodeum separated by at least twice their diameter on a large 



portion of propodeum 3a. brevis recalvus, new subspecies 



Metapleuron and propodeum entirely mat; punctures on propodeum separated 

 by less than twice their diameter, except sometimes in a narrow area adjacent 

 to the metapleuron 6 



6. Head, body, and legs entirely or mostly blackish; range: AUeghenian and 



Carolinian faunas 3b. brevis brevis (Cresson) 



Head, body, and legs ocherous; range: Austroriparian fauna. 



3c. brevis ochreus, new subspecies 



7. Hairs on propodeum and first tergite moderately dense, their bases separated 



from one another by about their length; fore wing about 2.4 mm. long. 



1. pygmaeus, new species 

 Hairs on propodeum and first tergite very sparse, their bases separated from 

 one another by several times their length; forewing about 3.3 mm. long. 



2. paludis, new species 

 BREVIS GROUP 



Frons and top part of pronotum with dense, appressed pubescence 

 in addition to sparser suberect setae; micro trichia on forewing little 

 larger and hardly denser in the transverse fuscous bands than between 

 and basad of the bands. 



The Neotropical Dipogon ariel Banks 1946 and Dipogon alastor 

 Banks 1946 and all the Nearctic species but graenicheri belong to this 

 group. 



1. Dipogon {Dipogon) pygmaeus, new species 



Male: Unknown. 



Female: Forewing 2.3 mm. long; frons, upper part of pronotum, 

 and mesoscutum mat, without noticeable punctures, with appressed 



Figure 70. — Locality for Dipogon pygmaeus. 



