diff --git a/.travis.yml b/.travis.yml
index fcfc1d4..70be178 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,30 +11,25 @@ branches:
     - /^WIP-.*$/
 install:
   - pip install -U pip tox virtualenv codecov
-before_script:
-  - if [[ $TRAVIS_PYTHON_VERSION == 3.6 ]]; then
-      pip install -U flake8 ;
-      flake8 *.py src --count --select=E901,E999,F821,F822,F823 --statistics ;
-    fi
-script:
-  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 || $TRAVIS_PYTHON_VERSION == 3.4 ]]; then
-      tox -e no-dilate ;
-    else
-      tox -e coverage ;
-    fi
 after_success:
   - codecov
 matrix:
   include:
     - python: 2.7
+      script: tox -e py27-nodilate
     - python: 3.4
+      script: tox -e py34-nodilate
     - python: 3.5
+      script: tox -e py35-coverage
     - python: 3.6
+      script: tox -e py36-coverage
     - python: 3.7
-      # we don't actually need sudo, but that kicks us onto GCE, which lets
-      # us get xenial
-      sudo: true
       dist: xenial
+      script: tox -e py37-coverage
     - python: nightly
+      script: tox -e py-coverage
+    - python: 3.6
+      script: tox -e flake8less
+      env: FLAKE8
   allow_failures:
     - python: nightly
diff --git a/tox.ini b/tox.ini
index 3c01425..d9c499b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,22 +4,25 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = {py27,py34,py35,py36,py37,pypy,flake8}
+# useful envs: py27-nodilate, py34-nodilate, py35, py36, py37, pypy, flake8
+envlist = {py27-nodilate,py34-nodilate,py35,py36,py37}
 skip_missing_interpreters = True
 minversion = 2.4.0
 
 [testenv]
 usedevelop = True
-extras = dev,dilate
+extras =
+    nodilate: dev
+    !nodilate: dev, dilate
 deps =
     pyflakes >= 1.2.3
+    coverage: coverage
 commands =
     pyflakes setup.py src
     wormhole --version
-    python -m wormhole.test.run_trial {posargs:wormhole}
-
-[testenv:no-dilate]
-extras = dev
+    !coverage: python -m wormhole.test.run_trial {posargs:wormhole}
+    coverage: coverage run --branch -m wormhole.test.run_trial {posargs:wormhole}
+    coverage: coverage xml
 
 # on windows, trial is installed as venv/bin/trial.py, not .exe, but (at
 # least appveyor) adds .PY to $PATHEXT. So "trial wormhole" might work on
@@ -29,16 +32,6 @@ extras = dev
 # vary on the platform. So we added a small class (wormhole.test.run_trial)
 # that does the right import for us.
 
-[testenv:coverage]
-deps =
-    pyflakes >= 1.2.3
-    coverage
-commands =
-    pyflakes setup.py src
-    wormhole --version
-    coverage run --branch -m wormhole.test.run_trial {posargs:wormhole}
-    coverage xml
-
 [testenv:flake8]
 deps = flake8
 commands = flake8 src/wormhole
@@ -47,3 +40,7 @@ commands = flake8 src/wormhole
 ignore = E741,W503,W504
 exclude = .git,__pycache__,docs/source/conf.py,old,build,dist
 max-complexity = 40
+
+[testenv:flake8less]
+deps = flake8
+commands = flake8 --select=E901,E999,F821,F822,F823 src/wormhole