Key to species of Rothilena gen. nov.

Males of R. golondrina sp. nov., R. sudcaliforniensis sp. nov. and R. naranjensis sp. nov. are unknown.

1 Males ............................................................................................... 2

- Females............................................................................................ 4

2(1) Basal part of RTA with a deep notch and two tips (Figs. 22, 24); conductor with a knob between distal and ectal projections (Fig. 18)....................................................................... Rothilena griswoldi sp. nov.

- Basal part of RTA with one tip (Figs. 34, 44); conductor without a knob (Fig. 21).................................. 3

3(2) In ventral view, basal part of RTA with anterior margin rounded (Figs. 32, 34)................ Rothilena cochimi sp. nov.

- In ventral view, basal part of RTA with anterior margin almost straight (Figs. 42, 44).............. Rothilena pilar sp. nov.

4(1) Hoods of epigynum as long as wide (Figs. 58, 59)............................... Rothilena sudcaliforniensis sp. nov.

- Hoods of epigynum otherwise (Figs. 27, 37, 47, 53, 65)....................................................... 5

5(4) Hoods covering only posterior part of atrium (Figs. 64, 65)............................. Rothilena naranjensis sp. nov.

- Hoods otherwise (Figs. 27, 37, 47, 53).................................................................... 6

6(5) Hoods with mesal margin concave (Figs. 52, 53)..................................... Rothilena golondrina sp. nov.

- Hoods with mesal margin straight (Figs. 27, 37, 47)......................................................... 7

7(6) Hoods covering more than half of the plate length (Figs. 26, 27); in posterior view, spermathecae separated by their diameter from ventral margin of the plate (Figs. 30, 31)......................................... Rothilena griswoldi sp. nov.

- Hoods covering half or less of the plate length (Figs. 37, 47); in posterior view, spermathecae adjacent to ventral margin of the plate (Figs. 41, 51).................................................................................... 8

8(7) Copulatory ducts with the tip of the anterior part directed laterally (Figs. 38, 39).............. Rothilena cochimi sp. nov.

- Copulatory ducts with the tip of the anterior part as shown in Figures 48 and 49 .................. Rothilena pilar sp. nov.